--- rpython/translator/platform/darwin.py.orig	2017-03-20 06:55:48.000000000 +1100
+++ rpython/translator/platform/darwin.py	2017-03-27 23:20:47.000000000 +1100
@@ -9,7 +9,7 @@
 # since 10.5, so we use that as minimum requirement. Bumped to 10.7
 # to allow the use of thread-local in __thread in C.
 #
-DARWIN_VERSION_MIN = '-mmacosx-version-min=10.7'
+DARWIN_VERSION_MIN = ''
 
 class Darwin(posix.BasePosix):
     name = "darwin"
@@ -39,7 +39,7 @@
         # we get the basename of the executable we're trying to build.
         return (list(self.shared_only)
                 + ['-dynamiclib', '-install_name', '@rpath/' + target_basename,
-                   '-undefined', 'dynamic_lookup', '-flat_namespace']
+                   '-undefined', 'dynamic_lookup']
                 + args)
 
     def _include_dirs_for_libffi(self):
@@ -111,11 +111,15 @@
 
 class Darwin_PowerPC(Darwin):#xxx fixme, mwp
     name = "darwin_powerpc"
+    link_flags = ('-arch', 'ppc')
+    cflags = ('-arch', 'ppc', '-O3')
 
 class Darwin_i386(Darwin):
     name = "darwin_i386"
-    DEFAULT_CC = 'clang -arch i386'
+    link_flags = ('-arch', 'i386')
+    cflags = ('-arch', 'i386', '-O3', '-fomit-frame-pointer')
 
 class Darwin_x86_64(Darwin):
     name = "darwin_x86_64"
-    DEFAULT_CC = 'clang -arch x86_64'
+    link_flags = ('-arch', 'x86_64')
+    cflags = ('-arch', 'x86_64', '-O3', '-fomit-frame-pointer')