diff --git a/Lib/distutils/command/install.py b/Lib/distutils/command/install.py
index 3c28c66..e3e387a 100644
--- a/Lib/distutils/command/install.py
+++ b/Lib/distutils/command/install.py
@@ -302,8 +302,8 @@
         # about needing recursive variable expansion (shudder).
 
         py_version = sys.version.split()[0]
-        prefix, exec_prefix, srcdir = get_config_vars('prefix', 'exec_prefix',
-                                                      'srcdir')
+        prefix, exec_prefix, srcdir, projectbase = get_config_vars('prefix', 'exec_prefix',
+                                                      'srcdir', 'projectbase')
 
         self.config_vars = {'dist_name': self.distribution.get_name(),
                             'dist_version': self.distribution.get_version(),
@@ -316,6 +316,7 @@
                             'sys_exec_prefix': exec_prefix,
                             'exec_prefix': exec_prefix,
                             'srcdir': srcdir,
+                            'projectbase': projectbase,
                            }
 
         self.config_vars['userbase'] = self.install_userbase
diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index 731aed3..91298d1 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -123,8 +123,8 @@
 
 if _PYTHON_BUILD:
     for scheme in ('posix_prefix', 'posix_home'):
-        _INSTALL_SCHEMES[scheme]['include'] = '{projectbase}/Include'
-        _INSTALL_SCHEMES[scheme]['platinclude'] = '{srcdir}'
+        _INSTALL_SCHEMES[scheme]['include'] = '{srcdir}/Include'
+        _INSTALL_SCHEMES[scheme]['platinclude'] = '{projectbase}/.'
 
 def _subst_vars(s, local_vars):
     try: