diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index 0c726d9..250ef38 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -387,11 +387,66 @@
 
 def _init_posix():
     """Initialize the module as appropriate for POSIX systems."""
-    # _sysconfigdata is generated at build time, see the sysconfig module
-    from _sysconfigdata import build_time_vars
+    g = {}
+    # load the installed Makefile:
+    try:
+        filename = get_makefile_filename()
+        parse_makefile(filename, g)
+    except IOError, 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()
+        parse_config_h(file(filename), g)
+    except IOError, 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)
+
+        elif sys.platform == 'beos':
+            # Linker script is in the config directory.  In the Makefile it is
+            # relative to the srcdir, which after installation no longer makes
+            # sense.
+            python_lib = get_python_lib(standard_lib=1)
+            linkerscript_path = string.split(g['LDSHARED'])[0]
+            linkerscript_name = os.path.basename(linkerscript_path)
+            linkerscript = os.path.join(python_lib, 'config',
+                                        linkerscript_name)
+
+            # XXX this isn't the right place to do this: adding the Python
+            # library to the link, if needed, should be in the "build_ext"
+            # command.  (It's also needed for non-MS compilers on Windows, and
+            # it's taken care of for them by the 'build_ext.get_libraries()'
+            # method.)
+            g['LDSHARED'] = ("%s -L%s/lib -lpython%s" %
+                             (linkerscript, PREFIX, get_python_version()))
+
     global _config_vars
-    _config_vars = {}
-    _config_vars.update(build_time_vars)
+    _config_vars = g
 
 
 def _init_nt():
diff --git a/Lib/pprint.py b/Lib/pprint.py
index 330099d..910283e 100644
--- a/Lib/pprint.py
+++ b/Lib/pprint.py
@@ -37,10 +37,7 @@
 import sys as _sys
 import warnings
 
-try:
-    from cStringIO import StringIO as _StringIO
-except ImportError:
-    from StringIO import StringIO as _StringIO
+from cStringIO import StringIO as _StringIO
 
 __all__ = ["pprint","pformat","isreadable","isrecursive","saferepr",
            "PrettyPrinter"]
diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index aa69351..d74ca39 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -278,10 +278,9 @@
         return os.path.join(_PROJECT_BASE, "Makefile")
     return os.path.join(get_path('platstdlib'), "config", "Makefile")
 
-def _generate_posix_vars():
-    """Generate the Python module containing build-time variables."""
-    import pprint
-    vars = {}
+
+def _init_posix(vars):
+    """Initialize the module as appropriate for POSIX systems."""
     # load the installed Makefile:
     makefile = _get_makefile_filename()
     try:
@@ -309,49 +308,6 @@
     if _PYTHON_BUILD:
         vars['LDSHARED'] = vars['BLDSHARED']
 
-    # There's a chicken-and-egg situation on OS X with regards to the
-    # _sysconfigdata module after the changes introduced by #15298:
-    # get_config_vars() is called by get_platform() as part of the
-    # `make pybuilddir.txt` target -- which is a precursor to the
-    # _sysconfigdata.py module being constructed.  Unfortunately,
-    # get_config_vars() eventually calls _init_posix(), which attempts
-    # to import _sysconfigdata, which we won't have built yet.  In order
-    # for _init_posix() to work, if we're on Darwin, just mock up the
-    # _sysconfigdata module manually and populate it with the build vars.
-    # This is more than sufficient for ensuring the subsequent call to
-    # get_platform() succeeds.
-    name = '_sysconfigdata'
-    if 'darwin' in sys.platform:
-        import imp
-        module = imp.new_module(name)
-        module.build_time_vars = vars
-        sys.modules[name] = module
-
-    pybuilddir = 'build/lib.%s-%s' % (get_platform(), sys.version[:3])
-    if hasattr(sys, "gettotalrefcount"):
-        pybuilddir += '-pydebug'
-    try:
-        os.makedirs(pybuilddir)
-    except OSError:
-        pass
-    destfile = os.path.join(pybuilddir, name + '.py')
-
-    with open(destfile, 'wb') as f:
-        f.write('# system configuration generated and used by'
-                ' the sysconfig module\n')
-        f.write('build_time_vars = ')
-        pprint.pprint(vars, stream=f)
-
-    # Create file used for sys.path fixup -- see Modules/getpath.c
-    with open('pybuilddir.txt', 'w') as f:
-        f.write(pybuilddir)
-
-def _init_posix(vars):
-    """Initialize the module as appropriate for POSIX systems."""
-    # _sysconfigdata is generated at build time, see _generate_posix_vars()
-    from _sysconfigdata import build_time_vars
-    vars.update(build_time_vars)
-
 def _init_non_posix(vars):
     """Initialize the module as appropriate for NT"""
     # set basic install directories
@@ -609,28 +565,3 @@
 
 def get_python_version():
     return _PY_VERSION_SHORT
-
-
-def _print_dict(title, data):
-    for index, (key, value) in enumerate(sorted(data.items())):
-        if index == 0:
-            print '%s: ' % (title)
-        print '\t%s = "%s"' % (key, value)
-
-
-def _main():
-    """Display all information sysconfig detains."""
-    if '--generate-posix-vars' in sys.argv:
-        _generate_posix_vars()
-        return
-    print 'Platform: "%s"' % get_platform()
-    print 'Python version: "%s"' % get_python_version()
-    print 'Current installation scheme: "%s"' % _get_default_scheme()
-    print
-    _print_dict('Paths', get_paths())
-    print
-    _print_dict('Variables', get_config_vars())
-
-
-if __name__ == '__main__':
-    _main()
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 05b09d5..93fb0cf 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -437,20 +437,15 @@
 			Modules/python.o \
 			$(BLDLIBRARY) $(LIBS) $(MODLIBS) $(SYSLIBS) $(LDLAST)
 
-platform: $(BUILDPYTHON) pybuilddir.txt
+platform: $(BUILDPYTHON)
 	$(RUNSHARED) $(PYTHON_FOR_BUILD) -c 'import sys ; from sysconfig import get_platform ; print get_platform()+"-"+sys.version[0:3]' >platform
 
-# Create build directory and generate the sysconfig build-time data there.
-# pybuilddir.txt contains the name of the build dir and is used for
-# sys.path fixup -- see Modules/getpath.c.
-pybuilddir.txt: $(BUILDPYTHON)
-		$(RUNSHARED) $(PYTHON_FOR_BUILD) -S -m sysconfig --generate-posix-vars
 
 # Build the shared modules
 # Under GNU make, MAKEFLAGS are sorted and normalized; the 's' for
 # -s, --silent or --quiet is always the first char.
 # Under BSD make, MAKEFLAGS might be " -s -v x=y".
-sharedmods: $(BUILDPYTHON) pybuilddir.txt
+sharedmods: $(BUILDPYTHON)
 	@case "$$MAKEFLAGS" in \
 	    *\ -s*|s*) quiet="-q";; \
 	    *) quiet="";; \
@@ -960,7 +955,7 @@
 		else	true; \
 		fi; \
 	done
-	@for i in $(srcdir)/Lib/*.py `cat pybuilddir.txt`/_sysconfigdata.py $(srcdir)/Lib/*.doc $(srcdir)/Lib/*.egg-info ; \
+	@for i in $(srcdir)/Lib/*.py $(srcdir)/Lib/*.doc $(srcdir)/Lib/*.egg-info ; \
 	do \
 		if test -x $$i; then \
 			$(INSTALL_SCRIPT) $$i $(DESTDIR)$(LIBDEST); \
@@ -1138,7 +1133,6 @@
 		--install-scripts=$(BINDIR) \
 		--install-platlib=$(DESTSHARED) \
 		--root=$(DESTDIR)/
-	-rm $(DESTDIR)$(DESTSHARED)/_sysconfigdata.py*
 
 # Here are a couple of targets for MacOSX again, to install a full
 # framework-based Python. frameworkinstall installs everything, the
diff --git a/Misc/NEWS b/Misc/NEWS
index 5c689f7..1f3601c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -216,10 +216,6 @@
 Library
 -------
 
-- Issue #13150: sysconfig no longer parses the Makefile and config.h files
-  when imported, instead doing it at build time.  This makes importing
-  sysconfig faster and reduces Python startup time by 20%.
-
 - Issue #10212: cStringIO and struct.unpack support new buffer objects.
 
 - Issue #12098: multiprocessing on Windows now starts child processes