Hi there, it seems that some A(P|B)I changes in the most recent gmp upload broke obby and causes its dependent applications to FTBFS (see RC bug #367862). A simple recompile of obby against the current gmp version in the archive fixed the compilation error for me, so please schedule a BinNMU of obby 0.3.0-3 across all arches. Kind regards, Philipp Kern