Starting with monotone-0.36, the monotone test suite fails in "make check" only on ppc and ppc64. Upstream reports it works on other powerpc platforms/distros. See http://koji.fedoraproject.org/koji/taskinfo?taskID=98891 for a build log with the failure. Rebuilding any monotone-0.36 rpm, or hand-building from upstream sources, will show failures in "make check" on ppc/ppc64 under Fedora [678], which all have the same compiler. The suspected issue is a miscompilation of some C++ code in the sqlite sources included in the monotone build. There was a similar problem seen using gcc 4.2 and worked around, see http://www.nabble.com/sqlite-fix-for-gcc-4.2.x-bug..-t4198798.html and http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32575 about that. The code that is failing now has the workaround shown in that link already. Without that workaround, the Fedora gcc does produce code that gets even more errors in monotone's test suite, though our gcc is 4.1.x-based and not 4.2. But even with it, something goes wrong inside sqlite and so we suspect a similar miscompilation issue. Since this only arises on ppc and ppc64 and I don't know how to work around it, for the time being I'm building a new monotone with ExcludeArch: ppc ppc64.
Seems to have disappeared in 0.37 or with newer compilers or something.