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 $LDFLAGS"
     ;;
+  *darwin*)
+    CFLAGS="${CFLAGS} -D__DARWIN__"
+    ;;
   *os2*)
     LDFLAGS="-no-undefined -Zbin-files $LDFLAGS"
     ;;
diff -Naur libdvdread.orig/src/dvd_reader.c libdvdread/src/dvd_reader.c
--- libdvdread.orig/src/dvd_reader.c	2009-03-13 21:28:21.000000000 -0400
+++ libdvdread/src/dvd_reader.c	2009-04-24 01:35:43.000000000 -0400
@@ -314,7 +314,7 @@
   char *new_path;
 
   /* If it doesn't start with "/dev/" or does start with "/dev/r" exit */
-  if( !strncmp( path, "/dev/",  5 ) || strncmp( path, "/dev/r", 6 ) )
+  if( strncmp( path, "/dev/",  5 ) || !strncmp( path, "/dev/r", 6 ) )
     return (char *) strdup( path );
 
   /* Replace "/dev/" with "/dev/r" */