diff -Naur libdvdread.orig/configure.ac libdvdread/configure.ac
--- libdvdread.orig/configure.ac	2009-01-08 17:57:10.000000000 -0500
+++ libdvdread/configure.ac	2009-04-24 01:50:56.000000000 -0400
@@ -145,6 +145,9 @@
   *cygwin*)
     LDFLAGS="-no-undefined $LDFLAGS"
     ;;
+  *darwin*)
+    AC_DEFINE(__DARWIN__, 1, Have Mac OS X system)
+    ;;
   *os2*)
     LDFLAGS="-no-undefined -Zbin-files $LDFLAGS"
     ;;