--- a/media/libaom/moz.build
+++ b/media/libaom/moz.build
@@ -23,19 +23,16 @@ if CONFIG['CPU_ARCH'] == 'x86_64':
         ASFLAGS += [ '-I%s/media/libaom/config/linux/x64/' % TOPSRCDIR ]
         CFLAGS += [ '-I%s/media/libaom/config/linux/x64/' % TOPSRCDIR ]
 elif CONFIG['CPU_ARCH'] == 'x86':
     EXPORTS.aom += files['IA32_EXPORTS']
     SOURCES += files['IA32_SOURCES']
     if CONFIG['OS_TARGET'] == 'WINNT':
         ASFLAGS += [ '-I%s/media/libaom/config/win/ia32/' % TOPSRCDIR ]
         CFLAGS += [ '-I%s/media/libaom/config/win/ia32/' % TOPSRCDIR ]
-    elif CONFIG['OS_TARGET'] == 'Darwin':
-        ASFLAGS += [ '-I%s/media/libaom/config/mac/ia32/' % TOPSRCDIR ]
-        CFLAGS += [ '-I%s/media/libaom/config/mac/ia32/' % TOPSRCDIR ]
     else: # Android, Linux, BSDs, etc.
         ASFLAGS += [ '-I%s/media/libaom/config/linux/ia32/' % TOPSRCDIR ]
         CFLAGS += [ '-I%s/media/libaom/config/linux/ia32/' % TOPSRCDIR ]
 elif CONFIG['CPU_ARCH'] == 'arm':
     EXPORTS.aom += files['ARM_EXPORTS']
     ASFLAGS += [
         '-I%s/media/libaom/config/linux/arm/' % TOPSRCDIR,
         '-I%s/libaom' % OBJDIR,