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From: Nathan Phillip Brink <ohnobinki@ohnopublishing.net>
Subject: Don't  compile against internal  zlib. Missing ./configure.ac
	changes  because ./configure.ac wasn't  shipped with  the dist
	tarball.
Date: 2011/04/27
Subject: Use @ZLIB_LIBS@ and @ZLIB_CFLAGS@ instead of $(ZLIB_LIBS) and
	friends because we don't get AC_SUBST() declared as Makefile
	variables for free. https://bugs.gentoo.org/371889
Date: 2011/06/16

--- a/autoconf/configure.in
+++ b/autoconf/configure.in
@@ -702,6 +702,8 @@
 wi_ARG_DISABLE_CCDV
 wi_PROG_CCDV
 
+PKG_CHECK_MODULES([ZLIB], [zlib])
+
 AC_SUBST(SSL_INCLUDES)
 AC_SUBST(SSL_LIBS)
 AC_SUBST(ENCRYPT_SRC)
@@ -716,7 +718,7 @@
 AC_SUBST(SEDOBJ)
 AC_SUBST(CCDV)
 
-AC_OUTPUT(Makefile data/Makefile data/networks/Makefile src/Makefile tools/Makefile tools/ircdcron/Makefile tools/ssl-cert/Makefile zlib/Makefile)
+AC_OUTPUT(Makefile data/Makefile data/networks/Makefile src/Makefile tools/Makefile tools/ircdcron/Makefile tools/ssl-cert/Makefile)
 
 echo
 echo =================================================================
--- a/Makefile.in
+++ b/Makefile.in
@@ -28,3 +28,3 @@
 SHELL=/bin/sh
-SUBDIRS=zlib src tools data @SUBDIR_MESSAGES@
+SUBDIRS = src tools data @SUBDIR_MESSAGES@
 SUBDIRS2=data/networks tools/ircdcron tools/ssl-cert

--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -53,9 +53,9 @@
 SSL_LIBS	= @SSL_LIBS@
 SSL_INCLUDES	= @SSL_INCLUDES@
 
-IRCDLIBS	= ../zlib/libz.a @LIBS@ $(SSL_LIBS)
+IRCDLIBS	= @ZLIB_LIBS@ @LIBS@ $(SSL_LIBS)
 
-INCLUDES	= -I../include -I../zlib $(SSL_INCLUDES)
+INCLUDES	= -I../include @ZLIB_CFLAGS@ $(SSL_INCLUDES)
 CPPFLAGS	= ${INCLUDES} @CPPFLAGS@
 
 default:	all