gentoo-overlay/dev-util/cmake/files/cmake-2.8.8-FindPkgConfig.patch

diff --git a/Modules/FindPkgConfig.cmake b/Modules/FindPkgConfig.cmake
index c47f583..5783d37 100644
--- a/Modules/FindPkgConfig.cmake
+++ b/Modules/FindPkgConfig.cmake
@@ -87,7 +87,12 @@
 set(PKG_CONFIG_VERSION 1)
 set(PKG_CONFIG_FOUND   0)
 
-find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
+if(NOT PKG_CONFIG_EXECUTABLE)
+	set(PKG_CONFIG_EXECUTABLE $ENV{PKG_CONFIG})
+	if(NOT PKG_CONFIG_EXECUTABLE)
+		find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
+	endif(NOT PKG_CONFIG_EXECUTABLE)
+endif(NOT PKG_CONFIG_EXECUTABLE)
 mark_as_advanced(PKG_CONFIG_EXECUTABLE)
 
 if(PKG_CONFIG_EXECUTABLE)