Problem finding libpq.so.4 in PG 8.1.4 RH EL4

Newbie here ..  RH EL4  Apache 2.0.48
Apologies if this isn't the right place for this post!

Trying to get PHP5 support running in PG 8.1.4 and regardless that I
have postgresql-libs-8.1.4-1PGDG.i686.rpm loaded and freshened on the
machine, when I try to bring up httpd, it complains that libpq.so.4
isn't loaded. I believe it lives in the above lib - am I not defining
where it lives properly maybe? (And where should a post like this go if
this isn't the right group??) I don't know if this an apache or a
postgres problem!)

tia!
Dave