If you look at the mainlog, you'll see that it is the benchmark which fails. The benchmark log, in turn, says
/export/d1/xenofarm/pike-7.6/gosroth.roxen.com/buildtmp/Pike-v7.6-snapshot/build/linux-2.6.8-gentoo-r3-ia64/pike -DNOT_INSTALLED -DPRECOMPILED_SEARCH_MORE -m/export/d1/xenofarm/pike-7.6/gosroth.roxen.com/buildtmp/Pike-v7.6-snapshot/build/linux-2.6.8-gentoo-r3-ia64/master.pike -x benchmark Lost track of a child (pid -1, errno from wait 10). _static_modules.Builtin()->create_process: _static_modules.Builtin()->create_process()->wait() /export/d1/xenofarm/pike-7.6/gosroth.roxen.com/buildtmp/Pike-v7.6-snapshot/lib/modules/Tools.pmod/Shoot.pmod/module.pmod:102: Tools.Shoot.ExecTest()->run(0,1,1) /export/d1/xenofarm/pike-7.6/gosroth.roxen.com/buildtmp/Pike-v7.6-snapshot/lib/modules/Tools.pmod/Standalone.pmod/benchmark.pike:65: Tools.Standalone.benchmark()->main(1,({"/export/d1/xenofarm/pike-7.6/gosroth.roxen.com/buildtmp/Pike-v7.6-snapshot/lib/modules/Tools.pmod/Standalone.pmod/benchmark.pike"}))