426,439c426,441
< 		# This should work on any unixy platform ;-)
< 		# If the user has bothered specifying additional -I and -L flags
< 		# in OPT and LDFLAGS we might as well use them here.
< 		#   NOTE: using shlex.split would technically be more correct, but
< 		# also gives a bootstrap problem. Let's hope nobody uses directories
< 		# with whitespace in the name to store libraries.
<         cflags, ldflags = sysconfig.get_config_vars('CFLAGS', 'LDFLAGS')
<         for item in cflags.split():
<             if item.startswith('-I'):
<                 inc_dirs.append(item[2:])
< 
<         for item in ldflags.split():
<             if item.startswith('-L'):
<                 lib_dirs.append(item[2:])
---
>         if platform == 'darwin':
>             # This should work on any unixy platform ;-)
>             # If the user has bothered specifying additional -I and -L flags
>             # in OPT and LDFLAGS we might as well use them here.
>             #   NOTE: using shlex.split would technically be more correct, but
>             # also gives a bootstrap problem. Let's hope nobody uses directories
>             # with whitespace in the name to store libraries.
>             cflags, ldflags = sysconfig.get_config_vars(
>                     'CFLAGS', 'LDFLAGS')
>             for item in cflags.split():
>                 if item.startswith('-I'):
>                     inc_dirs.append(item[2:])
> 
>             for item in ldflags.split():
>                 if item.startswith('-L'):
>                     lib_dirs.append(item[2:])
1255c1257
<         zlib_inc = find_file('zlib.h', [''], inc_dirs)
---
>         zlib_inc = find_file('zlib.h', [], inc_dirs)