* configure.in: only set HAVE_LIBZ if zlib.h exists

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@19154 138bc75d-0d04-0410-961f-82ee72b054a4

texinfo/ChangeLog

+Sun Apr 12 20:59:53 1998  Alexandre Oliva <oliva@dcc.unicamp.br>
+
+	* configure.in: only set HAVE_LIBZ if zlib.h exists
+
 Fri Apr 10 01:36:24 1998  Jim Wilson <wilson@cygnus.com>
 
 	* Makefile.am (SUBDIRS): Redefine to exclude info, po, util and doc.

texinfo/configure.in

@@ -27,7 +27,7 @@ AM_MAINTAINER_MODE
 AM_EXEEXT
 
 dnl Checks for libraries.
-AC_CHECK_LIB(z, gzdopen)
+AC_CHECK_HEADERS(zlib.h, [AC_CHECK_LIB(z, gzdopen)])
 
 # Needed on sysV68 for sigblock, sigsetmask.  But check for it in libc first.
 AC_CHECK_FUNC(sigblock, , AC_CHECK_LIB(bsd, sigblock))