From b3d56cb3645f93ae374badaca88dd2559e0c5421 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Thu, 15 Nov 2018 08:34:59 +0000
Subject: Another attempt to fix Travis build: making the build robust against
 older zlib.h header file

---
 generic/tclZipfs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/generic/tclZipfs.c b/generic/tclZipfs.c
index 428be15..4864a43 100644
--- a/generic/tclZipfs.c
+++ b/generic/tclZipfs.c
@@ -291,6 +291,11 @@ static const char pwrot[16] = {
 /*
  * Table to compute CRC32.
  */
+#ifdef Z_U4
+   typedef Z_U4 z_crc_t;
+#else
+   typedef unsigned long z_crc_t;
+#endif
 
 static const z_crc_t crc32tab[256] = {
     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
-- 
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