Add mac-specific compile pathway

CMakeLists.txt

@@ -2,6 +2,8 @@ PROJECT ( example )
 
 cmake_minimum_required( VERSION 3.16 )
 
+#add_compile_options(-DMAC)
+
 FIND_PACKAGE ( PkgConfig REQUIRED )
 PKG_CHECK_MODULES( GTK REQUIRED gtkmm-3.0)
 INCLUDE_DIRECTORIES ( ${GTK_INCLUDE_DIRS} )

main.cpp

@@ -1,4 +1,4 @@
-#include <gtkmm.h>
+#include "platform_includes.h"
 
 using namespace Glib;
 using namespace Gtk;

platform_includes.h

@@ -0,0 +1,5 @@
+#if defined MAC
+	#include <gtk/gtk.h>
+#else
+	#include <gtkmm.h>
+#endif