First batch of changes required for MacOS X build. Orignal submission from

Phil Atkin, merged by Robert Osfield.

src/osg/Makefile

@@ -135,6 +135,7 @@ TARGET_INCLUDE_FILES = \
 
 
 LIBS    =  $(GL_LIBS)
+MACOSXLIBS =  -lm -ldl -lstdc++
 
 LIB	= $(OSGHOME)/lib/lib$(TARGET_BASENAME).$(SO_EXT)
 #LIB	= $(OSGHOME)/lib/lib$(TARGET_BASENAME).a

src/osg/Timer.cpp

@@ -197,9 +197,9 @@ using namespace osg;
         }
 
     }
-#elif defined (__APPLE_CC__)  || defined (macintosh)
+#elif defined (__DARWIN_OSX__)  || defined (macintosh)
 
-#if defined (__APPLE_CC__)
+#if defined (__DARWIN_OSX__)
 	#include <Carbon/Carbon.h>         // do I really have to link against the Carbon framework just for this?
 #else	
 	#include <MacTypes.h>