We have an UltraSparc in house, but it's running Solaris 2.7 now.
AbiWord builds fine, but since Sun's compilers cost more than the 
stupid machine ($3,495 for the SunPro C++ compiler), I built EGCS
to do the compiling there.  Currently, it's only producing 32-bit 
binaries, and I'm not sure there is a 64-bit EGCS UltraSparc
target.
The problem is that we've introduced a word size problem in 
enumeration sizes with the File->Open dialog.  I'm fixing this
right now.
-- Shaw Terwilliger