--- old/make/jdk_generic_profile.sh	2012-07-30 23:59:24.944864432 +0100
+++ new/make/jdk_generic_profile.sh	2012-07-30 23:59:24.796861948 +0100
@@ -378,3 +378,22 @@
     export LLVM_LIBS
   fi
 fi
+
+# Export variables for system zlib
+# ZLIB_CFLAGS and ZLIB_LIBS tell the compiler how to compile and
+# link against zlib
+pkgconfig=$(which pkg-config 2>/dev/null)
+if [ -x "${pkgconfig}" ] ; then
+  if [ "${ZLIB_CFLAGS}" = "" ] ; then
+    ZLIB_CFLAGS=$("${pkgconfig}" --cflags zlib)
+  fi
+  if [ "${ZLIB_LIBS}" = "" ] ; then
+    ZLIB_LIBS=$("${pkgconfig}" --libs zlib)
+  fi
+fi
+if [ "${ZLIB_LIBS}" = "" ] ; then
+    ZLIB_LIBS="-lz"
+fi
+export ZLIB_CFLAGS
+export ZLIB_LIBS
+