Avoid the use of 'unset', which isn't available on all platforms. Fixes SF

bug #442627.

diff --git a/Makefile.pre.in b/Makefile.pre.in
index f81702b4509d9163181fff86f056a4c5be8b0149..9d8b40fa166aab40239f1d28624871f93e865c16 100644 (file)
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -282,7 +282,8 @@ platform: $(PYTHON)
 
 # Build the shared modules
 sharedmods: $(PYTHON)
-       PYTHONPATH= ./$(PYTHON) $(srcdir)/setup.py build
+       PYTHONPATH= PYTHONHOME= PYTHONSTARTUP= \
+               ./$(PYTHON) $(srcdir)/setup.py build
 
 # buildno should really depend on something like LIBRARY_SRC
 buildno: $(PARSER_OBJS) \