Fixing libdirs for CMakeLists

CMakeLists.txt

@@ -147,17 +147,17 @@ else ()
     # (but later on when installing)
     SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
 
-    SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
+    SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_LIBDIR}")
 
     # add the automatically determined parts of the RPATH
     # which point to directories outside the build tree to the install RPATH
     SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
 
 
     # the RPATH to be used when installing, but only if it's not a system directory
-    LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/lib" isSystemDir)
+    LIST(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_LIBDIR}" isSystemDir)
     IF("${isSystemDir}" STREQUAL "-1")
-       SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
+        SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_LIBDIR}")
     ENDIF("${isSystemDir}" STREQUAL "-1")
 
     if (APPLE)