Allow overrides of _multiarch_addendum and _sysconfig_name_tmpl, supp…

…orting the patches used by pkgsrc. Fixes #16.

distutils/__init__.py

@@ -15,9 +15,10 @@
 
 
 try:
-    # Allow Debian (only) to customize system behavior.
-    # Ref pypa/distutils#2. This hook is deprecated and
-    # no other environments should use it.
+    # Allow Debian and pkgsrc (only) to customize system
+    # behavior. Ref pypa/distutils#2 and pypa/distutils#16.
+    # This hook is deprecated and no other environments
+    # should use it.
     importlib.import_module('_distutils_system_mod')
 except ImportError:
     pass

distutils/sysconfig.py

@@ -279,14 +279,23 @@ def get_config_h_filename():
     return os.path.join(inc_dir, 'pyconfig.h')
 
 
+_makefile_tmpl = 'config-{python_ver}{build_flags}{multiarch}'
+
+
 def get_makefile_filename():
     """Return full pathname of installed Makefile from the Python build."""
     if python_build:
         return os.path.join(_sys_home or project_base, "Makefile")
     lib_dir = get_python_lib(plat_specific=0, standard_lib=1)
-    config_file = 'config-{}{}'.format(get_python_version(), build_flags)
-    if hasattr(sys.implementation, '_multiarch'):
-        config_file += '-%s' % sys.implementation._multiarch
+    multiarch = (
+        '-%s' % sys.implementation._multiarch
+        if hasattr(sys.implementation, '_multiarch') else ''
+    )
+    config_file = _makefile_tmpl.format(
+        python_ver=get_python_version(),
+        build_flags=build_flags,
+        multiarch=multiarch,
+    )
     return os.path.join(lib_dir, config_file, 'Makefile')
 
 
@@ -458,15 +467,21 @@ def expand_makefile_vars(s, vars):
 
 _config_vars = None
 
+
+_sysconfig_name_tmpl = '_sysconfigdata_{abi}_{platform}_{multiarch}'
+
+
 def _init_posix():
     """Initialize the module as appropriate for POSIX systems."""
     # _sysconfigdata is generated at build time, see the sysconfig module
-    name = os.environ.get('_PYTHON_SYSCONFIGDATA_NAME',
-        '_sysconfigdata_{abi}_{platform}_{multiarch}'.format(
-        abi=sys.abiflags,
-        platform=sys.platform,
-        multiarch=getattr(sys.implementation, '_multiarch', ''),
-    ))
+    name = os.environ.get(
+        '_PYTHON_SYSCONFIGDATA_NAME',
+        _sysconfig_name_tmpl.format(
+            abi=sys.abiflags,
+            platform=sys.platform,
+            multiarch=getattr(sys.implementation, '_multiarch', ''),
+        ),
+    )
     try:
         _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
     except ImportError: