Oh, wait:
>LIBS="-lsocket" ./configure --host=hppa1.0-hp-bsd
^^^
You're telling configure that you're a bsd flavor. If you do that, do you
have the libbsd.a stuff installed? If so, the LIBS="-lsocket" should be:
LIB="-lsocket -lbsd" ./configure --host=hppa1.0-hp-bsd.