I can reproduce the FTBFS here. gdb says: (gdb) disas $rip,$rip+1 Dump of assembler code from 0x7ffff6948f7d to 0x7ffff6948f7e: => 0x00007ffff6948f7d <THRandom_nextState+205>: pcmpeqq %xmm3,%xmm0 This is a SSE4.1 instruction, which my CPU doesn't support. BTW, please make your debian/rules honour DEB_BUILD_OPTIONS=nocheck. -- Jakub Wilk