Fix OSX build

Makefile

@@ -414,14 +414,15 @@ ifeq ($(PLATFORM),darwin)
   RENDERER_LIBS=
   OPTIMIZEVM=
 
-  BASE_CFLAGS = -Wall -Wimplicit -Wstrict-prototypes
+  BASE_CFLAGS = -Wall -Wimplicit -Wstrict-prototypes -mmacosx-version-min=10.5 \
+    -DMAC_OS_X_VERSION_MIN_REQUIRED=1050
 
   ifeq ($(ARCH),ppc)
-    BASE_CFLAGS += -arch ppc -faltivec -mmacosx-version-min=10.2
+    BASE_CFLAGS += -arch ppc -faltivec
     OPTIMIZEVM += -O3
   endif
   ifeq ($(ARCH),ppc64)
-    BASE_CFLAGS += -arch ppc64 -faltivec -mmacosx-version-min=10.2
+    BASE_CFLAGS += -arch ppc64 -faltivec
   endif
   ifeq ($(ARCH),x86)
     OPTIMIZEVM += -march=prescott -mfpmath=sse