[PATCH:libfontenc] Fail configure if zlib.h & -lz not found

[Alan Coopersmith]

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=31595

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 configure.ac |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index fb0b1af..9419909 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,8 +48,10 @@ XORG_FONT_MACROS_VERSION(1.1)
 XORG_FONTSUBDIR([ENCODINGSDIR], [encodingsdir], [encodings])
 
 # zlib
-
-AC_CHECK_LIB(z, gzclose) 
+AC_CHECK_HEADER([zlib.h], [],
+                AC_MSG_FAILURE([zlib.h is required to compile libfontenc]))
+AC_CHECK_LIB(z, gzclose, [],
+             AC_MSG_FAILURE([zlib is required to compile libfontenc]))
 
 # Check for dependencies
 PKG_CHECK_MODULES(FONTENC, xproto)
-- 
1.7.3.2