Compiling w. java support?

Hi,

I have to compile PSQL --with-java, but
when it starts to compile the JDBC driver
it gives up at the interface:

gmake[3]: Entering directory `/opt/postgresql-7.1.2/src/interfaces/jdbc'
/usr/bin/ant -buildfile ../../../build.xml -Dmajor=7 -Dminor=1
-Dfullversion=7.1.2 -Ddef_pgport=5432

It just waits and waits and waits for something...
If I remove the --with-java option, then the gmake
compiles the server.
What should I do? I need Java support.
Can I use this compiled version with an other
JDBC driver?

Thanks in advance!

Regards,

             Istvan