diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80b1743..02a93d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,6 +42,7 @@ ENDIF(BUILD_PYTHON)
 
 MESSAGE(STATUS "Using the target ${CosmoTool_local} to build python module")
 
+find_package(ZLIB)
 find_library(ZLIB_LIBRARY z)
 find_library(DL_LIBRARY dl)
 find_library(RT_LIBRARY rt)
@@ -82,7 +83,7 @@ SET(CPACK_PACKAGE_VERSION_MINOR "3")
 SET(CPACK_PACKAGE_VERSION_PATCH "4${EXTRA_VERSION}")
 SET(CPACK_PACKAGE_INSTALL_DIRECTORY "CosmoToolbox-${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}")
 SET(CPACK_STRIP_FILES "lib/libCosmoTool.so")
-SET(CPACK_SOURCE_IGNORE_FILES 
+SET(CPACK_SOURCE_IGNORE_FILES
 "/CVS/;/\\\\.git/;/\\\\.svn/;\\\\.swp$;\\\\.#;/#;.*~;cscope.*;/CMakeFiles/;.*\\\\.cmake;Makefile")
 
 add_subdirectory(src)