Apache2 install grief

Hello, I'm trying to install 4.0.4pl1 as a module to apache 2.0.16beta and failing miserably. Apache is built and running happily with DSO support but PHP fails to compile using apxs2. Error messages relate to php_apache.h and sapi_apache2.c (below) is this 'cause Apache2 has changed so much since the alpha when php 2.0.4pl1 was released or am I doing something wrong - there's nothing before line 24 in php_apache.h aside from a declaration. Thanks in adv Tim In file included from sapi_apache2.c:45: php_apache.h:24: parse error before `ap_bucket_brigade' php_apache.h:24: warning: no semicolon at end of struct or union php_apache.h:32: parse error before `}' php_apache.h:32: warning: type defaults to int' in declaration of php_struct' php_apache.h:32: warning: data definition has no type or storage class sapi_apache2.c: In function `php_apache_sapi_ub_write': sapi_apache2.c:49: `ap_bucket' undeclared (first use in this function) sapi_apache2.c:49: (Each undeclared identifier is reported only once sapi_apache2.c:49: for each function it appears in.) sapi_apache2.c:49: `b' undeclared (first use in this function)