--- cmake/FindPhononInternal.cmake.orig
+++ cmake/FindPhononInternal.cmake
@@ -99,6 +99,9 @@
     set(CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS "${CMAKE_SHARED_MODULE_CREATE_CXX_FLAGS} -flat_namespace -undefined dynamic_lookup")
 
    set(CMAKE_INSTALL_NAME_DIR ${LIB_INSTALL_DIR})
+   if (NOT IS_ABSOLUTE "${CMAKE_INSTALL_NAME_DIR}")
+     set(CMAKE_INSTALL_NAME_DIR "${CMAKE_INSTALL_PREFIX}/${LIB_INSTALL_DIR}")
+   endif()
 endif(APPLE)
 
 if (NOT PHONON_BUILD_PHONON4QT5) # Qt4