suricata/configure.ac

#TODO A better place for default CFLAGS?

AC_INIT(configure.ac)

    AM_CONFIG_HEADER(config.h)
    AM_INIT_AUTOMAKE(suricata, 1.4dev)

    AC_LANG_C
    AC_PROG_CC_C99
    AC_PROG_LIBTOOL

    AC_DEFUN([FAIL_MESSAGE],[
            echo
            echo
            echo "**********************************************"
            echo "  ERROR: unable to find" $1
            echo "  checked in the following places"
            for i in `echo $2`; do
            echo "        $i"
            done
            echo "**********************************************"
            echo
            exit 1
            ])

    AC_DEFUN([LIBNET_FAIL_WARN],[
            echo
            echo "*************************************************************************"
            echo "   Warning! libnet version 1.1.x could not be found in " $1
            echo "   Reject keywords will not be supported."
            echo "   If you require reject support plese install libnet 1.1.x. "
            echo "   If libnet is not installed in a non-standard location please use the"
            echo "   --with-libnet-includes and --with-libnet-libraries configure options"
            echo "*************************************************************************"
            echo
            ])

    if test `basename $CC` = "clang"; then
        CFLAGS="$CFLAGS -Wextra -Werror-implicit-function-declaration"
    fi
    if test `basename $CC` = "gcc"; then
        dnl get gcc version
        AC_MSG_CHECKING([gcc version])
                gccver=$($CC -dumpversion)
                gccvermajor=$(echo $gccver | cut -d . -f1)
                gccverminor=$(echo $gccver | cut -d . -f2)
                gccvernum=$(expr $gccvermajor "*" 100 + $gccverminor)
        AC_MSG_RESULT($gccver)

        if test "$gccvernum" -ge "400"; then
                dnl gcc 4.0 or later
                CFLAGS="$CFLAGS -Wextra -Werror-implicit-function-declaration"
                # remove optimization options that break our code
                # VJ 2010/06/27: no-tree-pre added. It breaks ringbuffers code.
                CFLAGS="$CFLAGS -fno-tree-pre"
        else
                CFLAGS="$CFLAGS -W"
        fi
    fi
    CFLAGS="$CFLAGS -Wall -fno-strict-aliasing"
    CFLAGS="$CFLAGS -Wno-unused-parameter"
    CFLAGS="$CFLAGS -std=gnu99"

    # Checks for programs.
    AC_PROG_AWK
    AC_PROG_CC
    AC_PROG_CPP
    AC_PROG_INSTALL
    AC_PROG_LN_S
    AC_PROG_MAKE_SET

    AC_PATH_PROG(HAVE_PKG_CONFIG, pkg-config, "no")
    if test "$HAVE_PKG_CONFIG" = "no"; then
        echo
        echo "   ERROR! pkg-config not found, go get it  "
        echo "   http://pkg-config.freedesktop.org/wiki/ "
        echo "   or install from your distribution       "
        echo
        exit 1
    fi

    AC_PATH_PROG(HAVE_COCCINELLE_CONFIG, spatch, "no")
    if test "$HAVE_COCCINELLE_CONFIG" = "no"; then
        echo
        echo "   Warning! spatch not found, you will not be "
        echo "   able to run code checking with coccinelle  "
        echo "   get it from http://coccinelle.lip6.fr      "
        echo "   or install from your distribution          "
        echo
    fi
    AM_CONDITIONAL([HAVE_COCCINELLE], [test "$HAVE_COCCINELLE_CONFIG" != "no"])


    # Checks for libraries.

    # Checks for header files.
    AC_CHECK_HEADERS([arpa/inet.h assert.h ctype.h errno.h fcntl.h inttypes.h])
    AC_CHECK_HEADERS([getopt.h])
    AC_CHECK_HEADERS([limits.h netdb.h netinet/in.h poll.h sched.h signal.h])
    AC_CHECK_HEADERS([stdarg.h stdint.h stdio.h stdlib.h string.h sys/ioctl.h])
    AC_CHECK_HEADERS([syslog.h sys/prctl.h sys/socket.h sys/stat.h sys/syscall.h])
    AC_CHECK_HEADERS([sys/time.h time.h unistd.h])
    AC_CHECK_HEADERS([sys/ioctl.h linux/if_ether.h linux/if_packet.h linux/filter.h])

    AC_CHECK_HEADERS([sys/socket.h net/if.h sys/mman.h linux/if_arp.h], [], [],
    [[#ifdef HAVE_SYS_SOCKET_H
        #include <sys/types.h>
        #include <sys/socket.h>
        #endif
    ]])

    AC_CHECK_HEADERS([windows.h winsock2.h ws2tcpip.h], [], [],
                    [[#define _X86_
                     ]])
    AC_CHECK_HEADERS([w32api/winbase.h], [], [],
                    [[#define _X86_
                     #include <windows.h>
                     ]])

    # Checks for typedefs, structures, and compiler characteristics.
    AC_C_INLINE
    AC_TYPE_PID_T
    AC_TYPE_SIZE_T
    AC_TYPE_INT32_T
    AC_TYPE_UINT16_T
    AC_TYPE_UINT32_T
    AC_TYPE_UINT64_T
    AC_TYPE_UINT8_T
    AC_HEADER_STDBOOL

    # Checks for library functions.
    AC_FUNC_MALLOC
    AC_FUNC_REALLOC
    AC_CHECK_FUNCS([gettimeofday memset strcasecmp strchr strdup strerror strncasecmp strtol strtoul memchr])

    # Add large file support
    AC_SYS_LARGEFILE

    #check for os
    AC_MSG_CHECKING([host os])

    # If no host os was detected, try with uname
    if test -z "$host" ; then
	    host="`uname`"
    fi
    echo -n "installation for $host OS... "

    e_magic_file="/usr/share/file/magic"
    case "$host" in
        *-*-*freebsd*)
            CFLAGS="${CFLAGS} -DOS_FREEBSD"
            CPPFLAGS="${CPPFLAGS} -I/usr/local/include -I/usr/local/include/libnet11"
            LDFLAGS="${LDFLAGS} -L/usr/local/lib -L/usr/local/lib/libnet11"
            e_magic_file="/usr/share/misc/magic"
            ;;
        *-*-openbsd5.1)
            CFLAGS="${CFLAGS} -D__OpenBSD__ -fgnu89-inline"
            CPPFLAGS="${CPPFLAGS} -I/usr/local/include -I/usr/local/include/libnet-1.1"
            LDFLAGS="${LDFLAGS} -L/usr/local/lib -I/usr/local/lib/libnet-1.1"
            e_magic_file="/usr/local/share/misc/magic.mgc"
            ;;
        *-*-openbsd5.2)
            CFLAGS="${CFLAGS} -D__OpenBSD__"
            CPPFLAGS="${CPPFLAGS} -I/usr/local/include -I/usr/local/include/libnet-1.1"
            LDFLAGS="${LDFLAGS} -L/usr/local/lib -I/usr/local/lib/libnet-1.1"
            e_magic_file="/usr/local/share/misc/magic.mgc"
            ;;
        *-*-openbsd*)
            CFLAGS="${CFLAGS} -D__OpenBSD__ -fgnu89-inline"
            CPPFLAGS="${CPPFLAGS} -I/usr/local/include -I/usr/local/include/libnet-1.1"
            LDFLAGS="${LDFLAGS} -L/usr/local/lib -I/usr/local/lib/libnet-1.1"
            e_magic_file="/usr/local/share/file/magic.mgc"
            ;;
        *darwin*|*Darwin*)
            CFLAGS="${CFLAGS} -DOS_DARWIN"
            CPPFLAGS="${CPPFLAGS} -I/opt/local/include"
            LDFLAGS="${LDFLAGS} -L/opt/local/lib"
            ;;
        *-*-linux*)
            #for now do nothing
            ;;
        *-*-mingw32*)
            CFLAGS="${CFLAGS} -DOS_WIN32"
            LDFLAGS="${LDFLAGS} -lws2_32"
            WINDOWS_PATH="yes"
            ;;
        *-*-cygwin)
            WINDOWS_PATH="yes"
            ;;
        *)
            AC_MSG_WARN([unsupported OS this may or may not work])
            ;;
    esac
    AC_MSG_RESULT(ok)

    #Enable support for gcc compile time security options. There is no great way to do detection of valid cflags that I have found
    #AX_CFLAGS_GCC_OPTION don't seem to do a better job than the code below and are a pain because of extra m4 files etc.
    #These flags seem to be supported on CentOS 5+, Ubuntu 8.04+, and FedoreCore 11+
    #Options are taken from https://wiki.ubuntu.com/CompilerFlags
    AC_ARG_ENABLE(gccprotect,
           AS_HELP_STRING([--enable-gccprotect], [Detect and use gcc hardening options]),,[enable_gccprotect=no])

    AS_IF([test "x$enable_gccprotect" = "xyes"], [
        #buffer overflow protection
        AC_MSG_CHECKING(for -fstack-protector)
        TMPCFLAGS="${CFLAGS}"
        CFLAGS="${CFLAGS} -fstack-protector"
        AC_TRY_LINK(,,SECCFLAGS="${SECCFLAGS} -fstack-protector"
        AC_MSG_RESULT(yes),
        AC_MSG_RESULT(no))
        CFLAGS="${TMPCFLAGS}"

        #compile-time best-practices errors for certain libc functions, provides checks of buffer lengths and memory regions
        AC_MSG_CHECKING(for -D_FORTIFY_SOURCE=2)
        TMPCFLAGS="${CFLAGS}"
        CFLAGS="${CFLAGS} -D_FORTIFY_SOURCE=2"
        AC_TRY_COMPILE(,,SECCFLAGS="${SECCFLAGS} -D_FORTIFY_SOURCE=2"
        AC_MSG_RESULT(yes),
        AC_MSG_RESULT(no))
        CFLAGS="${TMPCFLAGS}"

        #compile-time warnings about misuse of format strings
        AC_MSG_CHECKING(for -Wformat -Wformat-security)
        TMPCFLAGS="${CFLAGS}"
        CFLAGS="${CFLAGS} -Wformat -Wformat-security"
        AC_TRY_COMPILE(,,SECCFLAGS="${SECCFLAGS} -Wformat -Wformat-security"
        AC_MSG_RESULT(yes),
        AC_MSG_RESULT(no))
        CFLAGS="${TMPCFLAGS}"

        #provides a read-only relocation table area in the final ELF
        AC_MSG_CHECKING(for -z relro)
        TMPLDFLAGS="${LDFLAGS}"
        LDFLAGS="${LDFLAGS} -z relro"
        AC_TRY_LINK(,,SECLDFLAGS="${SECLDFLAGS} -z relro"
        AC_MSG_RESULT(yes),
        AC_MSG_RESULT(no))
        LDFLAGS="${TMPLDFLAGS}"

        #forces all relocations to be resolved at run-time
        AC_MSG_CHECKING(for -z now)
        TMPLDFLAGS="${LDFLAGS}"
        LDFLAGS="${LDFLAGS} -z now"
        AC_TRY_LINK(,,SECLDFLAGS="${SECLDFLAGS} -z now"
        AC_MSG_RESULT(yes),
        AC_MSG_RESULT(no))
        LDFLAGS="${TMPLDFLAGS}"

        CFLAGS="${CFLAGS} ${SECCFLAGS}"
        LDFLAGS="${LDFLAGS} ${SECLDFLAGS}"
    ])

    #enable profile generation
    AC_ARG_ENABLE(gccprofile,
           AS_HELP_STRING([--enable-gccprofile], [Enable gcc profile info i.e -pg flag is set]),,[enable_gccprofile=no])
    AS_IF([test "x$enable_gccprofile" = "xyes"], [
        CFLAGS="${CFLAGS} -pg"
    ])

    #enable gcc march=native gcc 4.2 or later
    AC_ARG_ENABLE(gccmarch_native,
           AS_HELP_STRING([--enable-gccmarch-native], [Enable gcc march=native gcc 4.2 and later only]),,[enable_gccmarch_native=yes])
    AS_IF([test "x$enable_gccmarch_native" = "xyes"], [
        if test `basename $CC` = "clang"; then
            OFLAGS="$CFLAGS"
            CFLAGS="$CFLAGS -march=native"
            AC_MSG_CHECKING([checking if $CC supports -march=native])
            AC_COMPILE_IFELSE(  [AC_LANG_PROGRAM([[#include <stdlib.h>]])],
                        [
                          AC_MSG_RESULT([yes])
                          CFLAGS="$OFLAGS -march=native"
                        ],
                        [
                          AC_MSG_RESULT([no])
                          CFLAGS="$OFLAGS"
                          enable_gccmarch_native=no
                        ]
                     )
        fi
        if test `basename $CC` = "gcc"; then
            case $host in
            *darwin*|*Darwin*)
            if test "$gccvernum" -ge "403"; then
                        dnl gcc 4.3 or later
                        CFLAGS="$CFLAGS -march=native"
            else
                enable_gccmarch_native=no
            fi
            ;;
            *)
            if test "$gccvernum" -ge "402"; then
                        dnl gcc 4.2 or later
                        CFLAGS="$CFLAGS -march=native"
            fi
            ;;
            esac
        fi
    ])

# options

  # enable the running of unit tests
    AC_ARG_ENABLE(unittests,
           AS_HELP_STRING([--enable-unittests], [Enable compilation of the unit tests]),,[enable_unittests=no])
    AS_IF([test "x$enable_unittests" = "xyes"], [
        UT_ENABLED="yes"
        CFLAGS="${CFLAGS} -DUNITTESTS"
    ])

    AM_CONDITIONAL([BUILD_UNITTESTS], [test "x$enable_unittests" = "xyes"])

  # enable workaround for old barnyard2 for unified alert output
    AC_ARG_ENABLE(old-barnyard2,
           AS_HELP_STRING([--enable-old-barnyard2], [Use workaround for old barnyard2 in unified2 output]),,[enable_old_barnyard2=no])
    AS_IF([test "x$enable_old_barnyard2" = "xyes"], [
        CFLAGS="${CFLAGS} -DHAVE_OLD_BARNYARD2"
    ])

  # enable debug output
    AC_ARG_ENABLE(debug,
           AS_HELP_STRING([--enable-debug], [Enable debug output]),,[enable_debug=no])
    AS_IF([test "x$enable_debug" = "xyes"], [
        CFLAGS="${CFLAGS} -DDEBUG"
    ])

  # enable debug validation functions & macro's output
    AC_ARG_ENABLE(debug-validation,
           AS_HELP_STRING([--enable-debug-validation], [Enable (debug) validation code output]),,[enable_debug_validation=no])
    AS_IF([test "x$enable_debug_validation" = "xyes"], [
        CFLAGS="${CFLAGS} -DDEBUG_VALIDATION"
    ])

  # profiling support
    AC_ARG_ENABLE(profiling,
           AS_HELP_STRING([--enable-profiling], [Enable performance profiling]),,[enable_profiling=no])
    AS_IF([test "x$enable_profiling" = "xyes"], [

	case "$host" in
           *-*-openbsd*)
		AC_MSG_ERROR([profiling is not supported on OpenBSD])
		;;
	   *)
		CFLAGS="${CFLAGS} -DPROFILING"
		;;
        esac
    ])

  # profiling support, locking
    AC_ARG_ENABLE(profiling-locks,
           AS_HELP_STRING([--enable-profiling-locks], [Enable performance profiling for locks]),,[enable_profiling_locks=no])
    AS_IF([test "x$enable_profiling_locks" = "xyes"], [
        CFLAGS="${CFLAGS} -DPROFILING -DPROFILE_LOCKING"
    ])

  # enable support for IPFW
    AC_ARG_ENABLE(ipfw,
            AS_HELP_STRING([--enable-ipfw], [Enable FreeBSD IPFW support for inline IDP]),,[enable_ipfw=no])
    AS_IF([test "x$enable_ipfw" = "xyes"], [
        CFLAGS="$CFLAGS -DIPFW"
    ])

# libraries

  #libpcre
    AC_ARG_WITH(libpcre_includes,
            [  --with-libpcre-includes=DIR  libpcre include directory],
            [with_libpcre_includes="$withval"],[with_libpcre_includes=no])
    AC_ARG_WITH(libpcre_libraries,
            [  --with-libpcre-libraries=DIR    libpcre library directory],
            [with_libpcre_libraries="$withval"],[with_libpcre_libraries="no"])

    if test "$with_libpcre_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libpcre_includes}"
    fi
    AC_CHECK_HEADER(pcre.h,,[AC_ERROR(pcre.h not found ...)])

    if test "$with_libpcre_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libpcre_libraries}"
    fi
    PCRE=""
    AC_CHECK_LIB(pcre, pcre_get_substring,, PCRE="no")
    if test "$PCRE" = "no"; then
        echo
        echo "   ERROR!  pcre library not found, go get it"
        echo "   from www.pcre.org."
        echo
        exit 1
    fi

    # To prevent duping the lib link we reset LIBS after this check. Setting action-if-found to NULL doesn't seem to work
    # see: http://blog.flameeyes.eu/2008/04/29/i-consider-ac_check_lib-harmful
    PCRE=""
    TMPLIBS="${LIBS}"
    AC_CHECK_LIB(pcre, pcre_dfa_exec,, PCRE="no")
    if test "$PCRE" = "no"; then
        echo
        echo "   ERROR!  pcre library was found but version was < 6.0"
        echo "   please upgrade to a newer version of pcre which you can get from"
        echo "   www.pcre.org."
        echo
        exit 1
    fi
    LIBS="${TMPLIBS}"

    AC_TRY_COMPILE([ #include <pcre.h> ],
        [ int eo = 0; eo |= PCRE_EXTRA_MATCH_LIMIT_RECURSION; ],
        [ pcre_match_limit_recursion_available=yes ], [:]
    )
    if test "$pcre_match_limit_recursion_available" != "yes"; then
        CFLAGS="${CFLAGS} -DNO_PCRE_MATCH_RLIMIT"
        echo
        echo "   Warning! pcre extra opt PCRE_EXTRA_MATCH_LIMIT_RECURSION not found"
        echo "   This could lead to potential DoS please upgrade to pcre >= 6.5"
        echo "   Continuing for now...."
        echo "   from www.pcre.org."
        echo
    fi

    #enable support for PCRE-jit available since pcre-8.20
    AC_MSG_CHECKING(for PCRE JIT support)
    AC_TRY_COMPILE([ #include <pcre.h> ],
        [
        int jit = 0;
        pcre_config(PCRE_CONFIG_JIT, &jit);
        ],
        [ pcre_jit_available=yes ], [ pcre_jit_available=no ]
        )

    if test "x$pcre_jit_available" = "xyes"; then
       AC_MSG_RESULT(yes)
       AC_DEFINE([PCRE_HAVE_JIT], [1], [Pcre with JIT compiler support enabled])

       AC_MSG_CHECKING(for PCRE JIT support usability)
       AC_TRY_COMPILE([ #include <pcre.h> ],
           [
           const char* regexstr = "(a|b|c|d)";
           pcre *re;
           const char *error;
           pcre_extra *extra;
           int err_offset;
           re = pcre_compile(regexstr,0, &error, &err_offset,NULL);
           extra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, &error);
           if (extra == NULL)
               exit(EXIT_FAILURE);
           int jit = 0;
           int ret = pcre_fullinfo(re, extra, PCRE_INFO_JIT, &jit);
           if (ret != 0 || jit != 1)
               exit(EXIT_FAILURE);
           exit(EXIT_SUCCESS);
           ],
           [ pcre_jit_works=yes ], [:]
       )
       if test "x$pcre_jit_works" != "xyes"; then
           AC_MSG_RESULT(no)
           echo
           echo "   PCRE JIT support detection worked but testing it failed"
           echo "   something odd is going on, please file a bug report."
           echo
           exit 1
       else
           AC_MSG_RESULT(yes)
       fi
    else
        AC_MSG_RESULT(no)
    fi

  # libyaml
    AC_ARG_WITH(libyaml_includes,
            [  --with-libyaml-includes=DIR  libyaml include directory],
            [with_libyaml_includes="$withval"],[with_libyaml_includes=no])
    AC_ARG_WITH(libyaml_libraries,
            [  --with-libyaml-libraries=DIR    libyaml library directory],
            [with_libyaml_libraries="$withval"],[with_libyaml_libraries="no"])

    if test "$with_libyaml_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libyaml_includes}"
    fi

    AC_CHECK_HEADER(yaml.h,,LIBYAML="no")

    if test "$with_libyaml_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libyaml_libraries}"
    fi

    LIBYAML=""
    AC_CHECK_LIB(yaml,yaml_parser_initialize,,LIBYAML="no")

    if test "$LIBYAML" = "no"; then
        echo
        echo "   ERROR!  libyaml library not found, go get it"
        echo "   from http://pyyaml.org/wiki/LibYAML "
        echo "   or your distribution:"
        echo
        echo "   Ubuntu: apt-get install libyaml-dev"
        echo "   Fedora: yum install libyaml-devel"
        echo
        exit 1
    fi

  # libpthread
    AC_ARG_WITH(libpthread_includes,
            [  --with-libpthread-includes=DIR  libpthread include directory],
            [with_libpthread_includes="$withval"],[with_libpthread_includes=no])
    AC_ARG_WITH(libpthread_libraries,
            [  --with-libpthread-libraries=DIR    libpthread library directory],
            [with_libpthread_libraries="$withval"],[with_libpthread_libraries="no"])

    if test "$with_libpthread_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libpthread_includes}"
    fi

    dnl AC_CHECK_HEADER(pthread.h,,[AC_ERROR(pthread.h not found ...)])

    if test "$with_libpthread_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libpthread_libraries}"
    fi

    PTHREAD=""
    AC_CHECK_LIB(pthread, pthread_create,, PTHREAD="no")

    if test "$PTHREAD" = "no"; then
        echo
        echo "   ERROR! libpthread library not found, glibc problem?"
        echo
        exit 1
    fi

  # libjansson
    enable_jansson="no"
    AC_ARG_WITH(libjansson_includes,
            [  --with-libjansson-includes=DIR  libjansson include directory],
            [with_libjansson_includes="$withval"],[with_libjansson_includes=no])
    AC_ARG_WITH(libjansson_libraries,
            [  --with-libjansson-libraries=DIR    libjansson library directory],
            [with_libjansson_libraries="$withval"],[with_libjansson_libraries="no"])

    if test "$with_libjansson_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libjansson_includes}"
    fi

    enable_jansson="no"
    enable_unixsocket="no"
    AC_CHECK_HEADER(jansson.h,JANSSON="yes",JANSSON="no")
    if test "$JANSSON" = "yes"; then
        if test "$with_libjansson_libraries" != "no"; then
            LDFLAGS="${LDFLAGS}  -L${with_libjansson_libraries}"
        fi

	    AC_CHECK_LIB(jansson, json_loads,, JANSSON="no")
        enable_jansson="yes"
        if test "$JANSSON" = "no"; then
            echo
            echo "   Jansson is required for features like unix socket"
            echo "   Go get it from your distribution of from:"
	        echo "     http://www.digip.org/jansson/"
            echo
            enable_unixsocket="no"
            enable_jansson="no"
        else
            case $host in
                *-*-mingw32*)
                ;;
                *-*-cygwin)
                ;;
                *)
                enable_unixsocket="yes"
                ;;
            esac
        fi
    fi

    AS_IF([test "x$enable_unixsocket" = "xyes"], [AC_DEFINE([BUILD_UNIX_SOCKET], [1], [Unix socket support enabled])])

    #enable support for NFQUEUE
    AC_ARG_ENABLE(nfqueue,
           AS_HELP_STRING([--enable-nfqueue], [Enable NFQUEUE support for inline IDP]),,[enable_nfqueue=no])
    AS_IF([test "x$enable_nfqueue" = "xyes"], [
        CFLAGS="$CFLAGS -DNFQ"

  # libnfnetlink
    case $host in
    *-*-mingw32*)
        ;;
    *)
        AC_ARG_WITH(libnfnetlink_includes,
                [  --with-libnfnetlink-includes=DIR  libnfnetlink include directory],
                [with_libnfnetlink_includes="$withval"],[with_libnfnetlink_includes=no])
        AC_ARG_WITH(libnfnetlink_libraries,
                [  --with-libnfnetlink-libraries=DIR    libnfnetlink library directory],
                [with_libnfnetlink_libraries="$withval"],[with_libnfnetlink_libraries="no"])

        if test "$with_libnfnetlink_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_libnfnetlink_includes}"
        fi

        AC_CHECK_HEADER(libnfnetlink/libnfnetlink.h,,[AC_ERROR(libnfnetlink.h not found ...)])

        if test "$with_libnfnetlink_libraries" != "no"; then
            LDFLAGS="${LDFLAGS}  -L${with_libnfnetlink_libraries}"
        fi

        NFNL=""
        AC_CHECK_LIB(nfnetlink, nfnl_fd,, NFNL="no")

        if test "$NFNL" = "no"; then
            echo
            echo "   ERROR!  nfnetlink library not found, go get it"
            echo "   from www.netfilter.org."
            echo "   we automatically append libnetfilter_queue/ when searching"
            echo "   for headers etc. when the --with-libnfnetlink-inlcudes directive"
            echo "   is used"
            echo
            exit 1
        fi
        ;;
    esac

  #libnetfilter_queue
    AC_ARG_WITH(libnetfilter_queue_includes,
            [  --with-libnetfilter_queue-includes=DIR  libnetfilter_queue include directory],
            [with_libnetfilter_queue_includes="$withval"],[with_libnetfilter_queue_includes=no])
    AC_ARG_WITH(libnetfilter_queue_libraries,
            [  --with-libnetfilter_queue-libraries=DIR    libnetfilter_queue library directory],
            [with_libnetfilter_queue_libraries="$withval"],[with_libnetfilter_queue_libraries="no"])

    if test "$with_libnetfilter_queue_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libnetfilter_queue_includes}"
    fi

    AC_CHECK_HEADER(libnetfilter_queue/libnetfilter_queue.h,,[AC_ERROR(libnetfilter_queue/libnetfilter_queue.h not found ...)])

    if test "$with_libnetfilter_queue_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libnetfilter_queue_libraries}"
    fi

    #LDFLAGS="${LDFLAGS} -lnetfilter_queue"

    NFQ=""
    case $host in
    *-*-mingw32*)
        AC_CHECK_LIB(netfilter_queue, nfq_open,, NFQ="no",-lws2_32)

        AC_ARG_WITH(netfilterforwin_includes,
            [  --with-netfilterforwin-includes=DIR  netfilterforwin include directory],
            [with_netfilterforwin_includes="$withval"],[with_netfilterforwin_includes=no])

        if test "$with_netfilterforwin_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_netfilterforwin_includes}"
        else
            CPPFLAGS="${CPPFLAGS} -I../../netfilterforwin"
        fi
        ;;
    *)
        AC_CHECK_LIB(netfilter_queue, nfq_open,, NFQ="no",)
        AC_CHECK_LIB([netfilter_queue], [nfq_set_queue_maxlen],AC_DEFINE_UNQUOTED([HAVE_NFQ_MAXLEN],[1],[Found queue max length support in netfilter_queue]) ,,[-lnfnetlink])
        AC_CHECK_LIB([netfilter_queue], [nfq_set_verdict2],AC_DEFINE_UNQUOTED([HAVE_NFQ_SET_VERDICT2],[1],[Found nfq_set_verdict2 function in netfilter_queue]) ,,[-lnfnetlink])
        AC_CHECK_LIB([netfilter_queue], [nfq_set_queue_flags],AC_DEFINE_UNQUOTED([HAVE_NFQ_SET_QUEUE_FLAGS],[1],[Found nfq_set_queue_flags function in netfilter_queue]) ,,[-lnfnetlink])

        # check if the argument to nfq_get_payload is signed or unsigned
        AC_MSG_CHECKING([for signed nfq_get_payload payload argument])
        STORECFLAGS="${CFLAGS}"
        if test `basename $CC` = "clang"; then
            CFLAGS="${CFLAGS} -Werror=incompatible-pointer-types"
        else
            CFLAGS="${CFLAGS} -Werror"
        fi
        AC_COMPILE_IFELSE(
            [AC_LANG_PROGRAM(
                [
                #include <libnetfilter_queue/libnetfilter_queue.h>
                ],
                [
                char *pktdata;
                nfq_get_payload(NULL, &pktdata);
                ])],
            [libnetfilter_queue_nfq_get_payload_signed="yes"],
            [libnetfilter_queue_nfq_get_payload_signed="no"])
        AC_MSG_RESULT($libnetfilter_queue_nfq_get_payload_signed)
        if test "x$libnetfilter_queue_nfq_get_payload_signed" = "xyes"; then
            AC_DEFINE([NFQ_GET_PAYLOAD_SIGNED], [1], [For signed version of nfq_get_payload])
        fi
        CFLAGS="${STORECFLAGS}"
    ;;
    esac

    if test "$NFQ" = "no"; then
        echo
        echo "   ERROR!  libnetfilter_queue library not found, go get it"
        echo "   from www.netfilter.org."
        echo "   we automatically append libnetfilter_queue/ when searching"
        echo "   for headers etc. when the --with-libnfq-includes directive"
        echo "   is used"
        echo
        exit 1
    fi
  ])

  # prelude
    AC_ARG_ENABLE(prelude,
            AS_HELP_STRING([--enable-prelude], [Enable Prelude support for alerts]),,[enable_prelude=no])
    AS_IF([test "x$enable_prelude" = "xyes"], [
        CFLAGS="$CFLAGS -DPRELUDE"
        AM_PATH_LIBPRELUDE(0.9.9, , AC_MSG_ERROR(Cannot find libprelude: Is libprelude-config in the path?), no)
        if test "x${LIBPRELUDE_CFLAGS}" != "x"; then
            CPPFLAGS="${CPPFLAGS} ${LIBPRELUDE_CFLAGS}"
        fi

        if test "x${LIBPRELUDE_LDFLAGS}" != "x"; then
            LDFLAGS="${LDFLAGS} ${LIBPRELUDE_LDFLAGS}"
        fi

        if test "x${LIBPRELUDE_LIBS}" != "x"; then
            LDFLAGS="${LDFLAGS} ${LIBPRELUDE_LIBS}"
        fi
    ])

  # libnet
    AC_ARG_WITH(libnet_includes,
            [  --with-libnet-includes=DIR     libnet include directory],
            [with_libnet_includes="$withval"],[with_libnet_includes="no"])

    AC_ARG_WITH(libnet_libraries,
            [  --with-libnet-libraries=DIR    libnet library directory],
            [with_libnet_libraries="$withval"],[with_libnet_libraries="no"])

    if test "x$with_libnet_includes" != "xno"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libnet_includes}"
        libnet_dir="${with_libnet_includes}"
    else
        libnet_dir="/usr/include /usr/local/include /usr/local/include/libnet11 /opt/local/include /usr/local/include/libnet-1.1"
    fi

    if test "x$with_libnet_libraries" != "xno"; then
        LDFLAGS="${LDFLAGS} -L${with_libnet_libraries}"
    fi

    LIBNET_DETECT_FAIL="no"
    LIBNET_INC_DIR=""

    for i in $libnet_dir; do
    if test -r "$i/libnet.h"; then
        LIBNET_INC_DIR="$i"
    fi
    done

    AC_MSG_CHECKING(for libnet.h version 1.1.x)
    if test "$LIBNET_INC_DIR" != ""; then
        if eval "grep LIBNET_VERSION $LIBNET_INC_DIR/libnet.h | grep -v 1.1 >/dev/null"; then
            AC_MSG_RESULT(no)
            LIBNET_DETECT_FAIL="yes"
            LIBNET_FAIL_WARN($libnet_dir)
        else
            AC_MSG_RESULT(yes)
        fi

        #CentOS, Fedora, Ubuntu-LTS, Ubuntu all set defines to the same values. libnet-config seems
        #to have been depreciated but all distro's seem to include it as part of the package.
        if test "$LIBNET_DETECT_FAIL" = "no"; then
            LLIBNET=""
            AC_CHECK_LIB(net, libnet_write,, LLIBNET="no")
            if test "$LLIBNET" != "no"; then
                CFLAGS="${CFLAGS} -DHAVE_LIBNET11 -D_BSD_SOURCE -D__BSD_SOURCE -D__FAVOR_BSD -DHAVE_NET_ETHERNET_H"
            else
            #if we displayed a warning already no reason to do it again.
                if test "$LIBNET_DETECT_FAIL" = "no"; then
                    LIBNET_DETECT_FAIL="yes"
                    LIBNET_FAIL_WARN($libnet_dir)
                fi
            fi

            # see if we have the patched libnet 1.1
            # http://www.inliniac.net/blog/2007/10/16/libnet-11-ipv6-fixes-and-additions.html
            #
            # To prevent duping the lib link we reset LIBS after this check. Setting action-if-found to NULL doesn't seem to work
            # see: http://blog.flameeyes.eu/2008/04/29/i-consider-ac_check_lib-harmful
            if test "$LIBNET_DETECT_FAIL" = "no"; then
                LLIBNET=""
                TMPLIBS="${LIBS}"
                AC_CHECK_LIB(net, libnet_build_icmpv6_unreach,, LLIBNET="no")
                if test "$LLIBNET" != "no"; then
                    CFLAGS="$CFLAGS -DHAVE_LIBNET_ICMPV6_UNREACH"
                fi
                LIBS="${TMPLIBS}"
            fi
        fi
    else
        LIBNET_DETECT_FAIL="yes"
        LIBNET_FAIL_WARN($libnet_dir)
    fi
    # libpfring (currently only supported for libpcap enabled pfring)
    # Error on the side of caution. If libpfring enabled pcap is being used and we don't link against -lpfring compilation will fail.
    AC_ARG_ENABLE(pfring,
           AS_HELP_STRING([--enable-pfring], [Enable Native PF_RING support]),,[enable_pfring=no])
    AS_IF([test "x$enable_pfring" = "xyes"], [
        CFLAGS="$CFLAGS -DHAVE_PFRING"

        #We have to set CFLAGS for AC_TRY_COMPILE as it doesn't pay attention to CPPFLAGS
        AC_ARG_WITH(libpfring_includes,
                [  --with-libpfring-includes=DIR  libpfring include directory],
                [with_libpfring_includes="$withval"],[with_libpfring_includes=no])
        AC_ARG_WITH(libpfring_libraries,
                [  --with-libpfring-libraries=DIR    libpfring library directory],
                [with_libpfring_libraries="$withval"],[with_libpfring_libraries="no"])

        if test "$with_libpfring_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_libpfring_includes}"
        fi

        if test "$with_libpfring_libraries" != "no"; then
            LDFLAGS="${LDFLAGS}  -L${with_libpfring_libraries}"
        fi

        LIBPFRING=""
        AC_CHECK_LIB(pfring, pfring_open,, LIBPFRING="no", [-lpcap])
        if test "$LIBPFRING" = "no"; then
            if test "x$enable_pfring" = "xyes"; then
            echo
            echo "   ERROR! --enable-pfring was passed but the library was not found or version is >4, go get it"
            echo "   from http://www.ntop.org/PF_RING.html"
            echo
            exit 1
            fi
        fi

        LIBPFRING_ENABLE_RING=""
        AC_CHECK_LIB(pfring, pfring_enable_ring,, LIBPFRING_ENABLE_RING="no", [-lpcap])
        if test "$LIBPFRING_ENABLE_RING" != "no"; then
            AC_DEFINE([HAVE_PFRING_ENABLE],[1],[PF_RING pfring_enable_ring is available])
        fi

        LIBPFRING_CLUSTER_TYPE=""
        AC_CHECK_LIB(pfring, pfring_set_cluster,
                        , LIBPFRING_CLUSTER_TYPE="no", [-lpcap])
        if test "$LIBPFRING_CLUSTER_TYPE" != "no"; then
            AC_DEFINE([HAVE_PFRING_CLUSTER_TYPE],[1],[PF_RING pfring_set_cluster is available])
        fi

        LIBPFRING_BPF_FILTER=""
        AC_CHECK_LIB(pfring, pfring_set_bpf_filter,
                        , LIBPFRING_BPF_FILTER="no", [-lpcap])
        LIBPFRING_REMOVE_BPF_FILTER=""
        AC_CHECK_LIB(pfring, pfring_remove_bpf_filter,
                        , LIBPFRING_REMOVE_BPF_FILTER="no", [-lpcap])
        if test "$LIBPFRING_BPF_FILTER" != "no" -a "$LIBPFRING_REMOVE_BPF_FILTER" != "no"; then
            AC_DEFINE([HAVE_PFRING_SET_BPF_FILTER],[1],[PF_RING pfring_set_bpf_filter is available])
        fi

        STORE_CFLAGS="${CFLAGS}"
        CFLAGS="${CFLAGS} -Werror"
        AC_MSG_CHECKING([if pfring_recv expects u_char**])
        AC_TRY_COMPILE([
                    #include <pfring.h>
                ],
                [
                    u_char *buffer;
                    pfring_recv(NULL, &buffer, 0, NULL, 1);
                ],
                [ pfring_recv_uchar_buff=yes ], [:])

        CFLAGS="${STORE_CFLAGS}"

        if test "$pfring_recv_uchar_buff" = "yes"; then
            AC_DEFINE([HAVE_PFRING_RECV_UCHAR],[1],[PF_RING pfring_recv buffer is u_char**])
            AC_MSG_RESULT(yes)
        else
            AC_MSG_RESULT(no)
        fi

        # check if the argument to nfq_get_payload is signed or unsigned
        AC_MSG_CHECKING([for post 5.4.0 pfring_open function])
        STORECFLAGS="${CFLAGS}"
        CFLAGS="${CFLAGS} -Werror"
        AC_COMPILE_IFELSE(
            [AC_LANG_PROGRAM(
                [
                #include <pfring.h>
                ],
                [
                pfring_open(NULL, 0, 0);
                ])],
            [pfring_new_open="yes"],
            [pfring_new_open="no"])
        AC_MSG_RESULT($pfring_new_open)
        if test "x$pfring_new_open" = "xyes"; then
            AC_DEFINE([HAVE_PFRING_OPEN_NEW], [1], [For post 5.4.0 version of pfring_open])
        fi
        CFLAGS="${STORECFLAGS}"

    ])


  # libpcap
    AC_ARG_WITH(libpcap_includes,
            [  --with-libpcap-includes=DIR  libpcap include directory],
            [with_libpcap_includes="$withval"],[with_libpcap_includes=no])
    AC_ARG_WITH(libpcap_libraries,
            [  --with-libpcap-libraries=DIR    libpcap library directory],
            [with_libpcap_libraries="$withval"],[with_libpcap_libraries="no"])

    if test "$with_libpcap_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libpcap_includes}"
    fi

    AC_CHECK_HEADER(pcap.h,,[AC_ERROR(pcap.h not found ...)])

    if test "$with_libpcap_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libpcap_libraries}"
    fi
    AC_CHECK_HEADERS([pcap.h pcap/pcap.h pcap/bpf.h])

    LIBPCAP=""
    AC_CHECK_LIB(pcap, pcap_open_live,, LIBPCAP="no", [-lpthread])
    if test "$LIBPCAP" = "no"; then
        echo
        echo "   ERROR!  libpcap library not found, go get it"
        echo "   from http://www.tcpdump.org or your distribution:"
        echo
        echo "   Ubuntu: apt-get install libpcap-dev"
        echo "   Fedora: yum install libpcap-devel"
        echo
        exit 1
    fi

    # pcap_activate and pcap_create only exists in libpcap >= 1.0
    LIBPCAPVTEST=""
    #To prevent duping the lib link we reset LIBS after this check. Setting action-if-found to NULL doesn't seem to work
    #see: http://blog.flameeyes.eu/2008/04/29/i-consider-ac_check_lib-harmful
    TMPLIBS="${LIBS}"
    AC_CHECK_LIB(pcap, pcap_activate,, LPCAPVTEST="no")
    if test "$LPCAPVTEST" != "no"; then
        AC_PATH_PROG(HAVE_PCAP_CONFIG, pcap-config, "no")
        if test "$HAVE_PCAP_CONFIG" = "no"; then
            CFLAGS="${CFLAGS} -DLIBPCAP_VERSION_MAJOR=1"
        else
            CFLAGS="${CFLAGS} `pcap-config --defines` `pcap-config --cflags` -DLIBPCAP_VERSION_MAJOR=1"
        fi
    else
        CFLAGS="${CFLAGS} -DLIBPCAP_VERSION_MAJOR=0"
    fi
    LIBS="${TMPLIBS}"

    #Appears as if pcap_set_buffer_size is linux only?
    LIBPCAPSBUFF=""
    #To prevent duping the lib link we reset LIBS after this check. Setting action-if-found to NULL doesn't seem to work
    #see: http://blog.flameeyes.eu/2008/04/29/i-consider-ac_check_lib-harmful
    TMPLIBS="${LIBS}"
    AC_CHECK_LIB(pcap, pcap_set_buffer_size,, LPCAPSBUFF="no")
    if test "$LPCAPSBUFF" != "no"; then
        CFLAGS="${CFLAGS} -DHAVE_PCAP_SET_BUFF"
    fi
    LIBS="${TMPLIBS}"

  # AF_PACKET support
    AC_ARG_ENABLE(af-packet,
           AS_HELP_STRING([--enable-af-packet], [Enable AF_PACKET support [default=yes]]),
                        ,[enable_af_packet=yes])
    AS_IF([test "x$enable_af_packet" = "xyes"], [
        AC_CHECK_DECL([TPACKET_V2],
            AC_DEFINE([HAVE_AF_PACKET],[1],[AF_PACKET support is available]),
            [enable_af_packet="no"],
            [[#include <sys/socket.h>
              #include <linux/if_packet.h>]])
        AC_CHECK_DECL([PACKET_FANOUT],
            AC_DEFINE([HAVE_PACKET_FANOUT],[1],[Packet fanout support is available]),
            [],
            [[#include <linux/if_packet.h>]])
    ])


  # libhtp
    AC_ARG_ENABLE(non-bundled-htp,
           AS_HELP_STRING([--enable-non-bundled-htp], [Enable the use of an already installed version of htp]),,[enable_non_bundled_htp=no])
    AS_IF([test "x$enable_non_bundled_htp" = "xyes"], [
        AC_ARG_WITH(libhtp_includes,
                [  --with-libhtp-includes=DIR  libhtp include directory],
                [with_libhtp_includes="$withval"],[with_libhtp_includes=no])
        AC_ARG_WITH(libhtp_libraries,
                [  --with-libhtp-libraries=DIR    libhtp library directory],
                [with_libhtp_libraries="$withval"],[with_libhtp_libraries="no"])

        if test "$with_libhtp_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_libhtp_includes}"
        fi

        if test "$with_libhtp_libraries" != "no"; then
            LDFLAGS="${LDFLAGS} -L${with_libhtp_libraries}"
        fi

        AC_CHECK_HEADER(htp/htp.h,,[AC_ERROR(htp/htp.h not found ...)])

        LIBHTP=""
        AC_CHECK_LIB(htp, htp_conn_create,, LIBHTP="no")
        if test "$LIBHTP" = "no"; then
            echo
            echo "   ERROR! libhtp library not found"
            echo
            exit 1
        fi
        PKG_CHECK_MODULES(LIBHTPMINVERSION, htp >= 0.2.3,[libhtp_minver_found="yes"],[libhtp_minver_found="no"])
        if test "$libhtp_minver_found" = "no"; then
            echo
            echo "   ERROR! libhtp was found but is not the minimum version required >=0.2.3"
            echo
            exit 1
        fi

        AC_CHECK_LIB([htp], [htp_config_register_request_uri_normalize],AC_DEFINE_UNQUOTED([HAVE_HTP_URI_NORMALIZE_HOOK],[1],[Found htp_config_register_request_uri_normalize function in libhtp]) ,,[-lhtp])
        # check for htp_tx_get_response_headers_raw
        AC_CHECK_LIB([htp], [htp_tx_get_response_headers_raw],AC_DEFINE_UNQUOTED([HAVE_HTP_TX_GET_RESPONSE_HEADERS_RAW],[1],[Found htp_tx_get_response_headers_raw in libhtp]) ,,[-lhtp])

    ])

    # even if we are using an installed htp lib we still need to gen Makefiles inside of htp
    AC_CONFIG_SUBDIRS([libhtp])
    AM_CONDITIONAL([BUILD_LIBHTP], [test "x$enable_non_bundled_htp" = "xno"])
    AS_IF([test "x$enable_non_bundled_htp" = "xno"], [
        AC_DEFINE_UNQUOTED([HAVE_HTP_URI_NORMALIZE_HOOK],[1],[Assuming htp_config_register_request_uri_normalize function in bundled libhtp])
        AC_DEFINE_UNQUOTED([HAVE_HTP_TX_GET_RESPONSE_HEADERS_RAW],[1],[Assuming htp_tx_get_response_headers_raw function in bundled libhtp])
    ])


  # enable CUDA output
    AC_ARG_ENABLE(cuda,
           AS_HELP_STRING([--enable-cuda], [Enable experimental CUDA pattern matching]),,[enable_cuda=no])
    AS_IF([test "x$enable_cuda" = "xyes"], [
        AC_ARG_WITH(cuda_includes,
                [  --with-cuda-includes=DIR  cuda include directory],
                [with_cuda_includes="$withval"],[with_cuda_includes=no])
        AC_ARG_WITH(cuda_libraries,
                [  --with-cuda-libraries=DIR    cuda library directory],
                [with_cuda_libraries="$withval"],[with_cuda_libraries="no"])
        AC_ARG_WITH(cuda_nvcc,
                [  --with-cuda-nvcc=DIR  cuda nvcc compiler directory],
                [with_cuda_nvcc="$withval"],[with_cuda_nvcc=no])

        CFLAGS="${CFLAGS} -D__SC_CUDA_SUPPORT__"

        if test "$with_cuda_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_cuda_includes}"
        else
            CPPFLAGS="${CPPFLAGS} -I/usr/local/cuda/include"
        fi

        if test "$with_cuda_libraries" != "no"; then
            LDFLAGS="${LDFLAGS} -L${with_cuda_libraries}"
        fi

        if test "$with_cuda_nvcc" != "no"; then
            NVCC_DIR="${with_cuda_nvcc}"
        else
            NVCC_DIR="/usr/local/cuda/bin"
        fi

        AC_CHECK_HEADER(cuda.h,,[AC_ERROR(cuda.h not found ...)])

        LIBCUDA=""
        AC_CHECK_LIB(cuda, cuArray3DCreate,, LIBCUDA="no")
        if test "$LIBCUDA" = "no"; then
            echo
            echo "   ERROR! libcuda library not found"
            echo
            exit 1
        fi

        AC_PATH_PROG([NVCC], [nvcc], no, [$PATH:$NVCC_DIR])
        if test "x$NVCC" = "xno"; then
            echo
            echo "   ERROR! CUDA nvcc compiler not found: use --with-cuda-nvcc=DIR"
            echo
            exit 1
        fi

        AC_MSG_CHECKING(for nvcc version)
        NVCCVER=`$NVCC --version | grep "release" | sed 's/.*release \(@<:@0-9@:>@\)\.\(@<:@0-9@:>@\).*/\1\2/'`
        AC_MSG_RESULT($NVCCVER)
        if test "$NVCCVER" -lt 31; then
            echo
            echo "   Warning! Your CUDA nvcc version might be outdated."
            echo "   If compilation fails try the latest CUDA toolkit from"
            echo "   www.nvidia.com/object/cuda_develop.html"
            echo
        fi

        AM_PATH_PYTHON(,, no)
        if test "x$PYTHON" = "xno"; then
            echo
            echo "   ERROR! Compiling CUDA kernels requires python."
            echo
            exit 1
        fi
    ])
    AM_CONDITIONAL([BUILD_CUDA], [test "x$enable_cuda" = "xyes"])


  # Check for libcap-ng
    case $host in
    *-*-linux*)
    AC_ARG_WITH(libcap_ng_includes,
            [  --with-libcap_ng-includes=DIR  libcap_ng include directory],
            [with_libcap-ng_includes="$withval"],[with_libcap_ng_includes=no])
    AC_ARG_WITH(libcap_ng_libraries,
            [  --with-libcap_ng-libraries=DIR    libcap_ng library directory],
            [with_libcap_ng_libraries="$withval"],[with_libcap_ng_libraries="no"])

    if test "$with_libcap_ng_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libcap_ng_includes}"
    fi

    if test "$with_libcap_ng_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libcap_ng_libraries}"
    fi

    AC_CHECK_HEADER(cap-ng.h,,LIBCAP_NG="no")
    if test "$LIBCAP_NG" != "no"; then
        LIBCAP_NG=""
        AC_CHECK_LIB(cap-ng,capng_clear,,LIBCAP_NG="no")
    fi

    if test "$LIBCAP_NG" != "no"; then
    CFLAGS="${CFLAGS} -DHAVE_LIBCAP_NG"
    fi

    if test "$LIBCAP_NG" = "no"; then
        echo
        echo "   WARNING!  libcap-ng library not found, go get it"
        echo "   from http://people.redhat.com/sgrubb/libcap-ng/"
        echo "   or your distribution:"
        echo
        echo "   Ubuntu: apt-get install libcap-ng-dev"
        echo "   Fedora: yum install libcap-ng-devel"
        echo
        echo "   Suricata will be built without support for dropping privs."
        echo
    fi
    ;;
    esac

  # Check for DAG support.
    AC_ARG_ENABLE(dag,
	        [  --enable-dag  Enable DAG capture],
	        [ enable_dag=yes ],
	        [ enable_dag=no])
    AC_ARG_WITH(dag_includes,
            [  --with-dag-includes=DIR  dagapi include directory],
            [with_dag_includes="$withval"],[with_dag_includes="no"])
    AC_ARG_WITH(dag_libraries,
            [  --with-dag-libraries=DIR  dagapi library directory],
            [with_dag_libraries="$withval"],[with_dag_libraries="no"])

    if test "$enable_dag" = "yes"; then

    	if test "$with_dag_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_dag_includes}"
        fi

        if test "$with_dag_libraries" != "no"; then
            LDFLAGS="${LDFLAGS} -L${with_dag_libraries}"
        fi

        AC_CHECK_HEADER(dagapi.h,DAG="yes",DAG="no")
        if test "$DAG" != "no"; then
            DAG=""
	    AC_CHECK_LIB(dag,dag_open,,DAG="no",)
        fi

        if test "$DAG" != "no"; then
            CFLAGS="${CFLAGS} -DHAVE_DAG"
        fi

        if test "$DAG" = "no"; then
            echo
            echo "  ERROR! libdag library not found"
            echo
            exit 1
        fi
    fi

  # libnspr
    enable_nspr="no"
    AC_ARG_WITH(libnspr_includes,
            [  --with-libnspr-includes=DIR  libnspr include directory],
            [with_libnspr_includes="$withval"],[with_libnspr_includes=no])
    AC_ARG_WITH(libnspr_libraries,
            [  --with-libnspr-libraries=DIR    libnspr library directory],
            [with_libnspr_libraries="$withval"],[with_libnspr_libraries="no"])

    if test "$with_libnspr_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libnspr_includes}"
    fi

    AC_CHECK_HEADER(nspr.h,NSPR="yes",NSPR="no")
    if test "$NSPR" = "yes"; then
        if test "$with_libnspr_libraries" != "no"; then
            LDFLAGS="${LDFLAGS}  -L${with_libnspr_libraries}"
        fi

        AC_CHECK_LIB(nspr4, PR_GetCurrentThread,, NSPR="no")

        if test "$NSPR" = "no"; then
            echo
            echo "   ERROR!  libnspr library not found, go get it"
            echo "   from Mozilla or your distribution:"
            echo
            echo "   Ubuntu: apt-get install libnspr4-dev"
            echo "   Fedora: yum install nspr-devel"
            echo
            exit 1
        fi
        enable_nspr="yes"
    fi

  # libnss
    enable_nss="no"
    AC_ARG_WITH(libnss_includes,
            [  --with-libnss-includes=DIR  libnss include directory],
            [with_libnss_includes="$withval"],[with_libnss_includes=no])
    AC_ARG_WITH(libnss_libraries,
            [  --with-libnss-libraries=DIR    libnss library directory],
            [with_libnss_libraries="$withval"],[with_libnss_libraries="no"])

    if test "$with_libnss_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libnss_includes}"
    fi

    AC_CHECK_HEADER(sechash.h,NSS="yes",NSS="no")
    if test "$NSS" = "yes"; then
        if test "$with_libnss_libraries" != "no"; then
            LDFLAGS="${LDFLAGS}  -L${with_libnss_libraries}"
        fi

        AC_CHECK_LIB(nss3, HASH_Begin,, NSS="no")

        if test "$NSS" = "no"; then
            echo
            echo "   ERROR!  libnss library not found, go get it"
            echo "   from Mozilla or your distribution:"
            echo
            echo "   Ubuntu: apt-get install libnss3-dev"
            echo "   Fedora: yum install nss-devel"
            echo
            exit 1
        fi

        AC_DEFINE([HAVE_NSS],[1],[libnss available for md5])
        enable_nss="yes"
    fi

  # libmagic
    AC_ARG_WITH(libmagic_includes,
            [  --with-libmagic-includes=DIR  libmagic include directory],
            [with_libmagic_includes="$withval"],[with_libmagic_includes=no])
    AC_ARG_WITH(libmagic_libraries,
            [  --with-libmagic-libraries=DIR    libmagic library directory],
            [with_libmagic_libraries="$withval"],[with_libmagic_libraries="no"])

    if test "$with_libmagic_includes" != "no"; then
        CPPFLAGS="${CPPFLAGS} -I${with_libmagic_includes}"
    fi

    AC_CHECK_HEADER(magic.h,,[AC_ERROR(magic.h not found ...)])

    if test "$with_libmagic_libraries" != "no"; then
        LDFLAGS="${LDFLAGS}  -L${with_libmagic_libraries}"
    fi

    MAGIC=""
    AC_CHECK_LIB(magic, magic_open,, MAGIC="no")

    if test "$MAGIC" = "no"; then
        echo
        echo "   ERROR!  magic library not found, go get it"
        echo "   from http://www.darwinsys.com/file/ or your distribution:"
        echo
        echo "   Ubuntu: apt-get install libmagic-dev"
        echo "   Fedora: yum install file-devel"
        echo
        exit 1
    fi

  # Napatech - Using the 3GD API
    AC_ARG_ENABLE(napatech,
                [  --enable-napatech   Enabled Napatech Devices],
                [ enable_napatech=yes ],
                [ enable_napatech=no])
    AC_ARG_WITH(napatech_includes,
                [  --with-napatech-includes=DIR   napatech include directory],
                [with_napatech_includes="$withval"],[with_napatech_includes="/opt/napatech3/include"])
    AC_ARG_WITH(napatech_libraries,
                [  --with-napatech-libraries=DIR  napatech library directory],
                [with_napatech_libraries="$withval"],[with_napatech_libraries="/opt/napatech3/lib"])

    if test "$enable_napatech" = "yes"; then
        CPPFLAGS="${CPPFLAGS} -I${with_napatech_includes}"
        LDFLAGS="${LDFLAGS} -L${with_napatech_libraries} -lntapi"
        AC_CHECK_HEADER(nt.h,NAPATECH="yes",NAPATECH="no")
        if test "$NAPATECH" != "no"; then
            NAPATECH=""
            AC_CHECK_LIB(ntapi, NT_Init,NAPATECH="yes",NAPATECH="no")
        fi

        if test "$NAPATECH" != "no"; then
            CFLAGS="${CFLAGS} -DHAVE_NAPATECH"
        fi

        if test "$NAPATECH" = "no"; then
            echo
            echo "  ERROR! libntapi library not found"
            echo
            exit 1
        fi
    fi

  # libluajit
    AC_ARG_ENABLE(luajit,
	        [  --enable-luajit  Enable Luajit support],
	        [ enable_luajit="yes"],
	        [ enable_luajit="no"])
    AC_ARG_WITH(libluajit_includes,
            [  --with-libluajit-includes=DIR  libluajit include directory],
            [with_libluajit_includes="$withval"],[with_libluajit_includes="no"])
    AC_ARG_WITH(libluajit_libraries,
            [  --with-libluajit-libraries=DIR    libluajit library directory],
            [with_libluajit_libraries="$withval"],[with_libluajit_libraries="no"])

    if test "$enable_luajit" = "yes"; then
        if test "$with_libluajit_includes" != "no"; then
            CPPFLAGS="${CPPFLAGS} -I${with_libluajit_includes}"
        else
            PKG_CHECK_MODULES([LUAJIT], [luajit])
            CPPFLAGS="${CPPFLAGS} ${LUAJIT_CFLAGS}"
        fi

        AC_CHECK_HEADER(lualib.h,LUAJIT="yes",LUAJIT="no")
        if test "$LUAJIT" = "yes"; then
            if test "$with_libluajit_libraries" != "no"; then
                LDFLAGS="${LDFLAGS}  -L${with_libluajit_libraries}"
            else
                PKG_CHECK_MODULES([LUAJIT], [luajit])
                LDFLAGS="${LDFLAGS} ${LUAJIT_LIBS}"
            fi

            AC_CHECK_LIB(luajit-5.1, luaL_openlibs,, LUAJIT="no")

            if test "$LUAJIT" = "no"; then
                echo
                echo "   ERROR!  libluajit library not found, go get it"
                echo "   from http://luajit.org/index.html or your distribution:"
                echo
                echo "   Ubuntu: apt-get install libluajit-5.1-dev"
                echo
                exit 1
            fi

            AC_DEFINE([HAVE_LUAJIT],[1],[libluajit available])
            enable_luajit="yes"
        else
	        echo
                echo "   ERROR!  libluajit headers not found, go get them"
                echo "   from http://luajit.org/index.html or your distribution:"
                echo
                echo "   Ubuntu: apt-get install libluajit-5.1-dev"
                echo
                exit 1
        fi
    fi

# get revision
    if test -f ./revision; then
        REVISION=`cat ./revision`
        CFLAGS="${CFLAGS} -DREVISION=\"${REVISION}\""
    else
        AC_PATH_PROG(HAVE_GIT_CMD, git, "no")
        if test "$HAVE_GIT_CMD" != "no"; then
            if [ test -d .git ]; then
                REVISION=`git rev-parse --short HEAD`
                CFLAGS="${CFLAGS} -DREVISION=\"${REVISION}\""
            fi
        fi
    fi

AC_SUBST(CFLAGS)
AC_SUBST(LDFLAGS)
AC_SUBST(CPPFLAGS)

define([EXPAND_VARIABLE],
[$2=[$]$1
if test $prefix = 'NONE'; then
	prefix="/usr/local"
fi
while true; do
  case "[$]$2" in
    *\[$]* ) eval "$2=[$]$2" ;;
    *) break ;;
  esac
done
eval "$2=[$]$2$3"
])dnl EXPAND_VARIABLE

# suricata log dir
if test "$WINDOWS_PATH" = "yes"; then
  systemtype="`systeminfo | grep \"based PC\"`"
  case "$systemtype" in
    *x64*)
      e_winbase="C:\\\\Program Files (x86)\\\\Suricata"
      ;;
    *)
      e_winbase="C:\\\\Program Files\\\\Suricata"
      ;;
  esac

  e_sysconfdir="$e_winbase\\\\"
  e_sysconfrulesdir="$e_winbase\\\\rules\\\\"
  e_magic_file="$e_winbase\\\\magic.mgc"
  e_logdir="$e_winbase\\\\log"
  e_logfilesdir="$e_logdir\\\\files"
else
  EXPAND_VARIABLE(localstatedir, e_logdir, "/log/suricata/")
  EXPAND_VARIABLE(localstatedir, e_rundir, "/run/")
  EXPAND_VARIABLE(localstatedir, e_logfilesdir, "/log/suricata/files")
  EXPAND_VARIABLE(sysconfdir, e_sysconfdir, "/suricata/")
  EXPAND_VARIABLE(sysconfdir, e_sysconfrulesdir, "/suricata/rules")
  EXPAND_VARIABLE(localstatedir, e_localstatedir, "/run/suricata")
fi
AC_SUBST(e_logdir)
AC_SUBST(e_rundir)
AC_SUBST(e_logfilesdir)
AC_SUBST(e_sysconfdir)
AC_SUBST(e_sysconfrulesdir)
AC_SUBST(e_localstatedir)
AC_DEFINE_UNQUOTED([CONFIG_DIR],["$e_sysconfdir"],[Our CONFIG_DIR])
AC_SUBST(e_magic_file)

AC_OUTPUT(Makefile src/Makefile qa/Makefile qa/coccinelle/Makefile rules/Makefile doc/Makefile contrib/Makefile contrib/file_processor/Makefile contrib/file_processor/Action/Makefile contrib/file_processor/Processor/Makefile suricata.yaml scripts/Makefile scripts/suricatasc/Makefile scripts/suricatasc/suricatasc)

echo "
Suricata Configuration:
  AF_PACKET support:                       ${enable_af_packet}
  PF_RING support:                         ${enable_pfring}
  NFQueue support:                         ${enable_nfqueue}
  IPFW support:                            ${enable_ipfw}
  DAG enabled:                             ${enable_dag}
  Napatech enabled:                        ${enable_napatech}
  Unix socket enabled:                     ${enable_unixsocket}

  libnss support:                          ${enable_nss}
  libnspr support:                         ${enable_nspr}
  libjansson support:                      ${enable_jansson}
  Prelude support:                         ${enable_prelude}
  PCRE jit:                                ${pcre_jit_available}
  libluajit:                               ${enable_luajit}
  Non-bundled htp:                         ${enable_non_bundled_htp}
  Old barnyard2 support:                   ${enable_old_barnyard2}
  CUDA enabled:                            ${enable_cuda}

  Unit tests enabled:                      ${enable_unittests}
  Debug output enabled:                    ${enable_debug}
  Debug validation enabled:                ${enable_debug_validation}
  Profiling enabled:                       ${enable_profiling}
  Profiling locks enabled:                 ${enable_profiling_locks}

Generic build parameters:
  Installation prefix (--prefix):          ${prefix}
  Configuration directory (--sysconfdir):  ${e_sysconfdir}
  Log directory (--localstatedir) :        ${e_logdir}

  Host:                                    ${host}
  GCC binary:                              ${CC}
  GCC Protect enabled:                     ${enable_gccprotect}
  GCC march native enabled:                ${enable_gccmarch_native}
  GCC Profile enabled:                     ${enable_gccprofile}

To build and install run 'make' and 'make install'.

You can run 'make install-conf' if you want to install initial configuration
files to ${e_sysconfdir}. Running 'make install-full' will install configuration
and rules and provide you a ready-to-run suricata."
echo
echo "To install Suricata into /usr/bin/suricata, have the config in
/etc/suricata and use /var/log/suricata as log dir, use:
./configure --prefix=/usr/ --sysconfdir=/etc/ --localstatedir=/var/"
echo