From 1670ca128118be1d914fc89223e94c4cff1bbf03 Mon Sep 17 00:00:00 2001
From: Jan Heylen <jan.heylen@nokia.com>
Date: Wed, 25 Oct 2017 06:45:49 +0200
Subject: [PATCH] Fix compilation without zlib

libtelnet source code uses '#if defived(HAVE_ZLIB)' as conditional flag for
optional compression support. But the configure(.ac) script does not play well
with this: it will define 'HAVE_ZLIB' to either 1 (zlib present) or 0
(zlib not present). For the C preprocessor, both cases mean 'defined'.

As a result, compilation will fail when trying to include zlib.h, which is
missing.

Signed-off-by: Jan Heylen <jan.heylen@nokia.com>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Upstream-status: upstream has changed to cmake iso autotools (but not yet
released) [1] and a pull request exists to fix several issues with that,
including correct handling of zlib detection [2].

[1] https://github.com/seanmiddleditch/libtelnet/commit/4860d10da44929554895c0ef83274f38de68e958
[2] https://github.com/seanmiddleditch/libtelnet/pull/54

diff --git a/configure.ac b/configure.ac
index 021b48f..c4dac8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,7 +33,7 @@ AC_HEADER_STDC
 PKG_CHECK_MODULES([zlib],
   [zlib],
   [AC_DEFINE([HAVE_ZLIB], [1], [Define to 1 if you have zlib.])],
-  [AC_DEFINE([HAVE_ZLIB], [0], [Define to 1 if you have zlib.])])
+  [AC_MSG_NOTICE([not enabling zlib support])])
 
 # Checks for header files.
 
-- 
2.7.4