PHP and pgsql 7.1

Greetings,

Trying to install PHP on a machine with the pgsql clients installed, e.g.:
  ./configure
  gmake -C src/bin install
  gmake -C src/interfaces install
  gmake -C doc install

After ./configuring PHP --with-pgsql, I get errors regarding missing
headers, namely libpq/libpq-fs.h (Note:  This is the same error I get when
trying to compile pgsql on the server machine --with-perl)

I noticed another post which said to remove the postgres.h include from
php, which I did.  The above error then shows up when compiling.

Using PHP 4.0.4pl1 and pgsql 7.1.

I do notice that the missing headers are included on the server machine,
though.

Thanks,

SWS