# compiling git with ZLIB < 1.2

1 messages from 2005-04-22 to 2005-04-22. Participants: Andreas Gal.
Thread: https://gitlist.dev/t/250

## Andreas Gal, 2005-04-22 22:12

Subject: compiling git with ZLIB < 1.2
Message-ID: <Pine.LNX.4.58.0504221508530.22285@sam.ics.uci.edu>
URL: https://gitlist.dev/e/Pine.LNX.4.58.0504221508530.22285%40sam.ics.uci.edu
In-Reply-To: <S262157AbVDVVWs/20050422212248Z+375@vger.kernel.org>

```

deflateBound() was added in ZLIB 1.2, but there is unfortunately no easy 
way to check against the ZLIB version. I would suggest to use the fix 
below until everyone has a recent ZLIB installed (neither my RHEL3 nor my 
Darwin box does by default).

Andreas

--- a/sha1_file.c
+++ b/sha1_file.c
@@ -240,7 +240,11 @@ int write_sha1_file(char *buf, unsigned 
 	/* Set it up */
 	memset(&stream, 0, sizeof(stream));
 	deflateInit(&stream, Z_BEST_COMPRESSION);
+#ifdef ONCE_EVERYONE_UPDATED_TO_ZLIB_12
 	size = deflateBound(&stream, len);
+#else	
+	size = len + ((len + 7) >> 3) + ((len + 63) >> 6) + 11;
+#endif	
 	compressed = malloc(size);
 
 	/* Compress it */

```