the php4 configure script gives me the following error:
checking external libexpat install dir... /usr/pkg/include
configure: error: not found. Please reinstall the expat distribution.
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/www/php4
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/www/php4


so I check if expat is installed:
pkg_info -a | grep expat
expat-1.95.6nb1     XML parser library written in C

seems it is installed , now I'm stuck ...