Index: b/Lib/distutils/sysconfig.py
===================================================================
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -430,49 +430,11 @@
 
 def _init_posix():
     """Initialize the module as appropriate for POSIX systems."""
-    g = {}
-    # load the installed Makefile:
-    try:
-        filename = get_makefile_filename()
-        parse_makefile(filename, g)
-    except OSError as msg:
-        my_msg = "invalid Python installation: unable to open %s" % filename
-        if hasattr(msg, "strerror"):
-            my_msg = my_msg + " (%s)" % msg.strerror
-
-        raise DistutilsPlatformError(my_msg)
-
-    # load the installed pyconfig.h:
-    try:
-        filename = get_config_h_filename()
-        with open(filename) as file:
-            parse_config_h(file, g)
-    except OSError as msg:
-        my_msg = "invalid Python installation: unable to open %s" % filename
-        if hasattr(msg, "strerror"):
-            my_msg = my_msg + " (%s)" % msg.strerror
-
-        raise DistutilsPlatformError(my_msg)
-
-    # On AIX, there are wrong paths to the linker scripts in the Makefile
-    # -- these paths are relative to the Python source, but when installed
-    # the scripts are in another directory.
-    if python_build:
-        g['LDSHARED'] = g['BLDSHARED']
-
-    elif get_python_version() < '2.1':
-        # The following two branches are for 1.5.2 compatibility.
-        if sys.platform == 'aix4':          # what about AIX 3.x ?
-            # Linker script is in the config directory, not in Modules as the
-            # Makefile says.
-            python_lib = get_python_lib(standard_lib=1)
-            ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')
-            python_exp = os.path.join(python_lib, 'config', 'python.exp')
-
-            g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)
-
+    # _sysconfigdata is generated at build time, see the sysconfig module
+    from _sysconfigdata import build_time_vars
     global _config_vars
-    _config_vars = g
+    _config_vars = {}
+    _config_vars.update(build_time_vars)
 
 
 def _init_nt():