scons: ppc support.
diff --git a/src/mesa/SConscript b/src/mesa/SConscript
index af8dfcb..89b98b3 100644
--- a/src/mesa/SConscript
+++ b/src/mesa/SConscript
@@ -283,6 +283,10 @@
 			'x86-64/glapi_x86-64.S'
 		]
 	elif gcc and env['machine'] == 'ppc':
+		env.Append(CPPDEFINES = [
+			'USE_PPC_ASM', 
+			'USE_VMX_ASM', 
+		])
 		mesa_sources += [
 			'ppc/common_ppc.c',
 		]