Fix a problem in site.py which triggers in case sys.path is empty.
Bugfix candidate for 2.2.2.
diff --git a/Lib/site.py b/Lib/site.py
index a6ffb59..0d1ea39 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -94,7 +94,8 @@
# (especially for Guido :-)
# XXX This should not be part of site.py, since it is needed even when
# using the -S option for Python. See http://www.python.org/sf/586680
-if os.name == "posix" and os.path.basename(sys.path[-1]) == "Modules":
+if (os.name == "posix" and sys.path and
+ os.path.basename(sys.path[-1]) == "Modules"):
from distutils.util import get_platform
s = "build/lib.%s-%.3s" % (get_platform(), sys.version)
s = os.path.join(os.path.dirname(sys.path[-1]), s)