--- /dev/null
+--- a/zlib.h
++++ b/zlib.h
+@@ -1563,12 +1563,7 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF(
+ * without large file support, _LFS64_LARGEFILE must also be true
+ */
+ #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
+- ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
+- ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
+- ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
+- ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
+- ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
+- ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
++ #define __zlib_largefile64
+ #endif
+
+ #if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
+@@ -1578,13 +1573,8 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF(
+ # define gzoffset gzoffset64
+ # define adler32_combine adler32_combine64
+ # define crc32_combine crc32_combine64
+-# ifdef _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));
+- ZEXTERN z_off_t ZEXPORT gzoffset64 OF((gzFile));
+- ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off_t));
+- ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off_t));
++# ifndef __zlib_largefile64
++# define __zlib_largefile64
+ # endif
+ #else
+ ZEXTERN gzFile ZEXPORT gzopen OF((const char *, const char *));
+@@ -1595,6 +1585,15 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF(
+ ZEXTERN uLong ZEXPORT crc32_combine OF((uLong, uLong, z_off_t));
+ #endif
+
++#ifdef __zlib_largefile64
++ ZEXTERN gzFile ZEXPORT gzopen64 OF((const char *, const char *));
++ ZEXTERN z_off64_t ZEXPORT gzseek64 OF((gzFile, z_off64_t, int));
++ ZEXTERN z_off64_t ZEXPORT gztell64 OF((gzFile));
++ ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
++ ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
++ ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
++#endif
++
+ /* hack for buggy compilers */
+ #if !defined(ZUTIL_H) && !defined(NO_DUMMY_DECL)
+ struct internal_state {int dummy;};