diff -up ghostscript-9.12/configure.ac.sys-zlib ghostscript-9.12/configure.ac
--- ghostscript-9.12/configure.ac.sys-zlib	2014-03-26 11:48:54.983972222 +0000
+++ ghostscript-9.12/configure.ac	2014-03-26 11:49:36.807230531 +0000
@@ -854,7 +854,7 @@ AC_MSG_CHECKING([for local zlib source])
 dnl zlib is needed for language level 3, and libpng
 # we must define ZLIBDIR regardless because png.mak does a -I$(ZLIBDIR)
 # this seems a harmless default
-ZLIBDIR=src
+ZLIBDIR=$includedir
 AUX_SHARED_ZLIB=
 
 if test -d $srcdir/zlib; then
diff -up ghostscript-9.12/configure.sys-zlib ghostscript-9.12/configure
--- ghostscript-9.12/configure.sys-zlib	2014-03-26 11:49:45.547284521 +0000
+++ ghostscript-9.12/configure	2014-03-26 11:49:56.171350127 +0000
@@ -6254,7 +6254,7 @@ fi
 $as_echo_n "checking for local zlib source... " >&6; }
 # we must define ZLIBDIR regardless because png.mak does a -I$(ZLIBDIR)
 # this seems a harmless default
-ZLIBDIR=src
+ZLIBDIR=$includedir
 AUX_SHARED_ZLIB=
 
 if test -d $srcdir/zlib; then

