Hi,
It's having trouble finding the postgresql headers, specifically libpq-fe.h. You have to figure out where on your distro this file is located.
On Debian, it's in /usr/include/postgresql , so in the Makefile, I set:
PGINC = /usr/include/postgresql
You may also have to change PGLIB to point to the Postgresql shared libraries on your distro. On Debian, I use:
PGLIB = /usr/lib/postgresql/lib
Good luck!