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: