Add --enable-luajit option to configure

configure.ac

@@ -1209,14 +1209,18 @@ AC_INIT(configure.ac)
     fi
 
   # libluajit
-    enable_luajit="no"
+    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="$withval"],[with_libluajit_includes=no])
+            [with_libluajit_includes="$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}"
         fi
@@ -1242,6 +1246,7 @@ AC_INIT(configure.ac)
             AC_DEFINE([HAVE_LUAJIT],[1],[libluajit available])
             enable_luajit="yes"
         fi
+    fi
 
 # get revision
     if test -f ./revision; then