openfts hasn't yet been ported to work with pg 7.2 which uses the tsearch contrib module instead of intarray. I have it to the point where it builds with pg 7.2, but I haven't tested it yet.
It might be possible to use the current version of openfts with pg 7.2, as the intarray module is still present I think? Did you do make install-all-headers when you installed pg 7.2?
