Make it so that the project compile on the Mac platform.

CMakeLists.txt

@@ -111,8 +111,12 @@ endif()
 find_package(Doxygen)
 find_package(PythonInterp)
 if(USE_SDL)
-	set(SDL_BUILDING_LIBRARY 1)		# Required to avoid linking with SDLmain...
-	find_package(SDL 1.2 EXACT)
+    if(!APPLE)
+        # Required to avoid linking with SDLmain except for OS X where it is necessary
+        # due to the need to have NSApplication correctly setup by SDLmain.
+        set(SDL_BUILDING_LIBRARY 1)
+    endif()
+    find_package(SDL 1.2 EXACT)
 endif()
 
 if(MSVC)

src/core/Core.cpp

@@ -147,6 +147,13 @@ ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
 
 #include "window/RenderWindow.h"
 
+// Under OS X we want SDLmain to replace the entry point with its own.
+// TODO: I don't think this is wanted and we'll need to add the NSApplication setup
+// on the Arx Libertatis side instead of SDLmain's.
+#if defined(__APPLE__) && defined(__MACH__)
+    #include <SDL.h>
+#endif
+
 class TextManager;
 
 using std::min;