Looks like I found the solution to my problem, I had two versions of postgres installed and when I ran the "./configure --with-aolserver-src=/usr/local/src/aolserver/aolserver" from the "next steps" documentation, it picked up the old postgres include dir, so I chnaged the following /usr/local/src/Search-OpenFTS-tcl-0.2/Makefile.global variables:
PGINSTDIR
PGLIBDIR
PGINCDIR
to point to my latest version of postgres 7.2.
the load.sql file the worked fine.
Jon.