From a832224f64b9bfea3006c34f6b66a23ca9db2a92 Mon Sep 17 00:00:00 2001
From: Utkarsh Ayachit <ayachit@z2-fe.z2.vis.kaust.edu.sa>
Date: Mon, 1 Apr 2013 08:22:38 +0300
Subject: [PATCH 1/2] Add ability to use system zlib.

---
 Projects/zlib.cmake            |    3 +--
 Projects/zlib.use.system.cmake |    6 ++++++
 2 files changed, 7 insertions(+), 2 deletions(-)
 create mode 100644 Projects/zlib.use.system.cmake

diff --git a/Projects/zlib.cmake b/Projects/zlib.cmake
index 8adf975..a1145b8 100644
--- a/Projects/zlib.cmake
+++ b/Projects/zlib.cmake
@@ -1,7 +1,6 @@
-
 # zlib supports cmake. the only problem is that we need to remove the zconf.h
 # file.
-add_external_project(
+add_external_project_or_use_system(
   zlib
   # remove the zconf.h as a patch step.
   PATCH_COMMAND ${CMAKE_COMMAND} -E remove -f <SOURCE_DIR>/zconf.h
diff --git a/Projects/zlib.use.system.cmake b/Projects/zlib.use.system.cmake
new file mode 100644
index 0000000..ff28b3d
--- /dev/null
+++ b/Projects/zlib.use.system.cmake
@@ -0,0 +1,6 @@
+find_package(ZLIB)
+
+add_extra_cmake_args(
+   -DZLIB_INCLUDE_DIR:PATH=${ZLIB_INCLUDE_DIR}
+   -DZLIB_LIBRARY:FILEPATH=${ZLIB_LIBRARY}
+)
-- 
1.7.1