building cppunit on open suse linux 64 bit

Hello,
    We have a project requirement to have parallel builds output for
cppunit 32 bit and 64 bit.

Although the lib files are created in separate directories lib and lib64,
the .o files are not kept separately.
       After doing the build for 32 bit, 'clean' has to be done before
building for 64 bit.

What changes needs to be done so that object files are created in separate
directories for 32 and 64 bit builds.
 Since, for 64 bit builds, the lib path is generated as lib64, it must be
possible to append 64 to the build directories which contain the object
files

Any help would be useful.

Regards,
Ginu