In file included from /home/user/mozembed/gecko-dev/objdir-armel/xpcom/threads/Unified_cpp_xpcom_threads0.cpp:29:0: /home/user/mozembed/gecko-dev/xpcom/threads/ThreadStackHelper.cpp: In member function 'void mozilla::ThreadStackHelper::GetStack(mozilla::ThreadStackHelper::Stack&)': /home/user/mozembed/gecko-dev/xpcom/threads/ThreadStackHelper.cpp:239:17: error: 'SYS_rt_tgsigqueueinfo' was not declared in this scope