[Zope] ZPatterns make problem part2

[Owen Smith]

I installed the dev version of python which solved my first problem but
when I do a make I get this

zope@phonix:/usr/local/dc/zope/lib/python/Products/ZPatterns$ make
gcc -fPIC  -I../../ZODB -I../../../Components/ExtensionClass -g -O2
-I/usr/include/python1.5 -I/usr/include/python1.5 -DHAVE_CONFIG_H -c
./DynPersist.c
In file included from ./DynPersist.c:1:
../../ZODB/cPersistence.h:89: ExtensionClass.h: No such file or
directory
make: *** [DynPersist.o] Error 1

Am I missing something? / the point!?
reading http://www.digicool.com/releases/ExtensionClass/ it says that
ExtensionClass  is part of Zope
and I cant find any mention of this on zope.org

Thanks
Owen