diff --git a/configure.ac b/configure.ac
index 65c622c394..67d316b761 100644
--- a/configure.ac
+++ b/configure.ac
@@ -198,6 +198,8 @@
             e_magic_file="/usr/local/share/misc/magic.mgc"
             ;;
         *darwin*|*Darwin*)
+            LUA_PC_NAME="lua-5.1"
+            LUA_LIB_NAME="lua-5.1"
             CFLAGS="${CFLAGS} -DOS_DARWIN"
             CPPFLAGS="${CPPFLAGS} -I/opt/local/include"
             LDFLAGS="${LDFLAGS} -L/opt/local/lib"