CMake change

[nicolastd]

When trying to compile GKlib, I would like to specify the installation lib. This is a standard CMake mechanism, but it is not working at the moment. However, the simple patch bellow allow to use make config ... CONFIG_FLAGS="-DCMAKE_INSTALL_LIBDIR=$HOME/ParMETIS/lib" properly.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a9a694..e13b403 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -221,11 +221,11 @@ install(DIRECTORY "${CMAKE_SOURCE_DIR}/include/"
 install(EXPORT GKlibTargets
   FILE        GKlibTargets.cmake
   NAMESPACE   GKlib::
-  DESTINATION lib/cmake/GKlib
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/GKlib
   COMPONENT   GKlib_Development)
 
 install(
   FILES       ${CMAKE_CURRENT_BINARY_DIR}/cmake/GKlibConfig.cmake
               ${CMAKE_CURRENT_BINARY_DIR}/cmake/GKlibConfigVersion.cmake
-  DESTINATION lib/cmake/GKlib
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/GKlib
   COMPONENT   GKlib_Development)