how to compile postgresql with other version of openssl?

Postgresql is first linux program based on automake I've ever seen
(and i've been compiling linux stuff nice 1999) that does not allow
specyfying lib locations on ./configure like
(like --with-openssl=/path/to/openssl)

So how do I link it to other version of openssl than one that is
present in os system directories?
I've tried:
PKG_CONFIG=/usr/openssl-0.9.8zg/lib/pkgconfig ./configure --with-openssl
LD_LIBRARY_PATH=/usr/openssl-0.9.8zg/lib ./configure --with-openssl
LDFLAGS="-L/usr/openssl-0.9.8zg/lib" ./configure --with-openssl

but build binnary is linked to system openssl (check for example by
ldd src/psql/psql|grep ssl)
./configure script does not even say what openssl files it checks.

I've also tried
./configure --includedir=/usr/openssl-0.9.8zg/include
--with-libraries=/usr/openssl-0.9.8zg/lib --with-openssl
it does in this case it does not even complete ./configure script