http://sourceforge.net/apps/phpbb/free-cad/viewtopic.php?f=4&t=847&p=6364

Index: src/Main/MainGui.cpp
===================================================================
--- a/src/Main/MainGui.cpp	(revision 4193)
+++ a/src/Main/MainGui.cpp	(working copy)
@@ -149,10 +149,10 @@
     // http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=559846
     putenv("LANG=C");
     putenv("LC_ALL=C");
-    putenv("PYTHONPATH=");
+    //putenv("PYTHONPATH=");
 #else
     setlocale(LC_NUMERIC, "C");
-    _putenv("PYTHONPATH=");
+    //_putenv("PYTHONPATH=");
 #endif
 
     // Name and Version of the Application
