Hi, AGTk 2.4 RPMs for x86-64 Fedora Core 4 can now be found here: http://www.vislab.uq.edu.au/research/accessgrid/software/fedora/ The source tarball AccessGrid-2.4-3.01.src.tar.bz2 also on that page includes a number of x86-64 specific fixes for those that wish to build from the source code. Cheers, Doug