Dependencies: on macOS, use Frameworks as last option

CMakeLists.txt

@@ -2,6 +2,14 @@
 cmake_minimum_required( VERSION 3.1 )
 project( "GMX" VERSION 1.0.0 LANGUAGES CXX )
 
+# By default prefer not to use frameworks on macOS.
+# But use it at a "LAST" resource, if no other options worked.
+# For details on the behaviour of this cache variable, see:
+# - https://cmake.org/cmake/help/v3.0/command/find_file.html
+set( CMAKE_FIND_FRAMEWORK "LAST" CACHE STRING
+   "Framework finding behaviour on macOS" )
+
+
 add_subdirectory(GeoModelXml)
 add_subdirectory(GMXPlugin)