64 bit Pegasus libraries on AIX 6.1

Hi all, I am working in a product which makes use of Pegasus libraries
like libpegcommon.so, libpegprovider.so, libpegconfig.so. On Linux, these
are available in both, 32 bit and 64 bit format and we can build from
sources in both formats as well. But on AIX, 64 bit libraries are not
present and I do not see a 64 bit build target for AIX.
There is only one build target present for AIX i.e. AIX_RS_IBMCXX, which
builds 32 bit.

Can someone point me to 64 bit libraries or build procedure for getting it?