Cross compiling for OS X

Makefile

@@ -425,6 +425,22 @@ ifeq ($(PLATFORM),darwin)
     OPTIMIZEVM += -arch x86_64 -mfpmath=sse
   endif
 
+  ifeq ($(CROSS_COMPILING),1)
+    ifeq ($(ARCH),ppc)
+      CC=powerpc-apple-darwin10-gcc
+      RANLIB=powerpc-apple-darwin10-ranlib
+    else
+      ifeq ($(ARCH),x86)
+        CC=i686-apple-darwin10-gcc
+        RANLIB=i686-apple-darwin10-ranlib
+      else
+        $(error Architecture $(ARCH) is not supported when cross compiling)
+      endif
+    endif
+  else
+    TOOLS_CFLAGS += -DMACOS_X
+  endif
+
   BASE_CFLAGS += -fno-strict-aliasing -DMACOS_X -fno-common -pipe
 
   ifeq ($(USE_OPENAL),1)
@@ -466,8 +482,6 @@ ifeq ($(PLATFORM),darwin)
 
   NOTSHLIBCFLAGS=-mdynamic-no-pic
 
-  TOOLS_CFLAGS += -DMACOS_X
-
 else # ifeq darwin
 
 
@@ -835,6 +849,14 @@ endif #NetBSD
 endif #IRIX
 endif #SunOS
 
+ifndef CC
+  CC=gcc
+endif
+
+ifndef RANLIB
+  RANLIB=gcc
+endif
+
 ifneq ($(HAVE_VM_COMPILED),true)
   BASE_CFLAGS += -DNO_VM_COMPILED
   BUILD_GAME_QVM=0
@@ -1969,7 +1991,7 @@ ifneq ($(strip $(LIBSDLMAIN)),)
 ifneq ($(strip $(LIBSDLMAINSRC)),)
 $(LIBSDLMAIN) : $(LIBSDLMAINSRC)
 	cp $< $@
-	ranlib $@
+	$(RANLIB) $@
 endif
 endif