Compiling on HP-UX 11.11

Hi,

I have a customer trying to compile PostgreSQL 7.3.1 on HP-UX with GCC, and
he can't to it.  He gets these configure errors:

checking build system type... hppa2.0w-hp-hpux11.11
checking host system type... hppa2.0w-hp-hpux11.11
checking which template to use... hpux
[...]
checking sys/socket.h presence... yes
configure: WARNING: sys/socket.h: present but cannot be compiled
configure: WARNING: sys/socket.h: check for missing prerequisite headers?
configure: WARNING: sys/socket.h: proceeding with the preprocessor's result
[...]
checking types of arguments for accept()... configure: error: could not
determine argument types

Has anyone managed to get this to work?

Regards,

David.