--- ./zlib.h.orig	2010-04-19 23:12:48.000000000 -0500
+++ ./zlib.h	2011-02-09 12:12:15.000000000 -0600
@@ -1578,7 +1578,7 @@
 #  define gzoffset gzoffset64
 #  define adler32_combine adler32_combine64
 #  define crc32_combine crc32_combine64
-#  ifdef _LARGEFILE64_SOURCE
+#  ifndef _LARGEFILE64_SOURCE
      ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
      ZEXTERN z_off_t ZEXPORT gzseek64 OF((gzFile, z_off_t, int));
      ZEXTERN z_off_t ZEXPORT gztell64 OF((gzFile));