Harry Henry Gebel: get extra compiler flags from the CFLAGS environment
variable.

(Is this really needed?  Can we drop it when the config file mechanism
allows users to set compiler flags in setup.cfg?)
diff --git a/Lib/distutils/command/build_ext.py b/Lib/distutils/command/build_ext.py
index deb3b13..aa9ea0d 100644
--- a/Lib/distutils/command/build_ext.py
+++ b/Lib/distutils/command/build_ext.py
@@ -295,6 +295,14 @@
             macros = build_info.get ('macros')
             include_dirs = build_info.get ('include_dirs')
             extra_args = build_info.get ('extra_compile_args')
+            # honor CFLAGS enviroment variable
+            # XXX do we *really* need this? or is it just a hack until
+            # the user can put compiler flags in setup.cfg?
+            if os.environ.has_key('CFLAGS'):
+                if not extra_args:
+                    extra_args = []
+                extra_args = string.split(os.environ['CFLAGS']) + extra_args
+                
             objects = self.compiler.compile (sources,
                                              output_dir=self.build_temp,
                                              macros=macros,