static linkage with libpq?

Hello,

while I can link against libpq.so on my system (Debian 3.0, PG 7.2),
I cannot link against libpq.a. In the latter case I obtain errors like

/tmp/ccLM7BSR.o(.text+0x69): undefined reference to `PQsetdbLogin'

/usr/lib/libpq.a is installed and contains the following objects:

dalitz:[test]> ar t /usr/lib/libpq.a
fe-print.o
fe-lobj.o
fe-exec.o
fe-connect.o
fe-auth.o
md5.o
fe-misc.o
wchar.o
pqsignal.o
pqexpbuffer.o
encnames.o
dllist.o

Any ideas?

Christoph Dalitz