HP-UX Itanium Plugin compilation

Hi …

I am trying to compile the ver 1.4.5 plugins on a

HP-UX **** B.11.23 U ia64 0498960858 unlimited-user license

Itanium HP-Ux server …

I have installed a ver 4.1 gcc and when I run the ./configure i receive this
error message when configure stops …

checking for socklen_t… no
checking for socklen_t equivalent… configure: error: Cannot find a type to use in place of socklen_t

Do you know how to solve this prob ?