does pgxs work?

I'm having trouble with pgxs and it seems like either it's doing something
actively wrong which defeats the purpose of having pgxs or I'm doing something
wrong in how I'm using it.

I have postgres installed in /usr/local/pgsql in addition to having the debian
packages installed in the usual places. My Makefile explicitly calls the
development install:

PGXS := $(shell /usr/local/pgsql/bin/pg_config --pgxs)

Yet the results get definitions that try to pull in the regular install:

# makefile (from `/r3/usr_local/pgsql/lib/pgxs/src/makefiles/../../src/Makefile.global', line 126)
includedir := /usr/include/postgresql

And it doesn't even get those right anyways:

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Winline -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -g -fpic -I. -I/usr/include/postgresql/server -I/usr/include/postgresql/internal -D_GNU_SOURCE -c -o test.o test.c -MMD
test.c:19:22: error: postgres.h: No such file or directory
test.c:20:18: error: fmgr.h: No such file or directory
test.c:21:28: error: libpq/pqformat.h: No such file or directory
test.c:22:28: error: utils/memutils.h: No such file or directory

It seems like the point of pgxs is precisely to find the correct locations for
these files. If it only works with standard locations then we could just hard
code them in Makefiles. So I'm pretty sure this is supposed to work.

What could I be doing wrong?

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com