http://trac.sagemath.org/sage_trac/ticket/9723
Previous versions of Sage have built 64-bit SPARC, though they needed even more
.spkg files, since several important Solaris updates were merged in
4.5.3.alpha0. However, I don't have a record of what versions of Sage would
work, though I know 4.5.0 would, given a sufficient number of new .spkg files.
The error message seems related to M4RI, though I don't think that's been
updated recently.
Dave