[Zope] Install latest zope on Debian Sarge?

Hello, When installing the latest zope 2.8.1 (I want to upgrade plone to 2.1) I ran into problems compiling. I quote the last rows of the output her below. How can I compile this zope on a debian sarge server? output: AccessControl/cAccessControl.c: In function `initcAccessControl': AccessControl/cAccessControl.c:2323: error: `NULL' undeclared (first use in this function) AccessControl/cAccessControl.c:2323: error: beginwaarde-element is niet constant AccessControl/cAccessControl.c:2323: error: (near initialization for `RestrictedDTMLMixinType.ob_type') error: command 'gcc' failed with exit status 1 make: *** [build] Fout 1 gcc version: gcc --version gcc (GCC) 3.3.5 (Debian 1:3.3.5-13)