CMake: resolve macOS RPATH issues

CMakeLists.txt

@@ -65,7 +65,9 @@ ENDIF()
 # Set up the RPATH so executables find the libraries even when installed in non-default location
 SET(CMAKE_MACOSX_RPATH TRUE)
 SET(CMAKE_SKIP_BUILD_RPATH FALSE)
+SET(CMAKE_SKIP_INSTALL_RPATH FALSE)
 SET(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE)
+SET(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_FULL_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)
@@ -76,6 +78,11 @@ IF("${IsSystemDir}" STREQUAL "-1")
    SET(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
 ENDIF("${IsSystemDir}" STREQUAL "-1")
 
+IF(APPLE)
+  SET(CMAKE_INSTALL_NAME_DIR "@rpath")
+  SET(CMAKE_INSTALL_RPATH "@loader_path/../lib") # self relative LIBDIR
+ENDIF()
+
 # Include corry cmake functions
 INCLUDE("cmake/corryvreckan.cmake")