➜  minetest-official git:(master) ✗ make -j2
Scanning dependencies of target jsoncpp
Scanning dependencies of target GenerateVersion
[  0%] -- *** Detected git version 0.4.9-120-g3e52dd5-dirty ***
Building CXX object src/json/CMakeFiles/jsoncpp.dir/jsoncpp.cpp.o
[  0%] Built target GenerateVersion
Linking CXX static library libjsoncpp.a
[  0%] Built target jsoncpp
Scanning dependencies of target minetestserver
Scanning dependencies of target minetest
[  0%] Building CXX object src/CMakeFiles/minetestserver.dir/jthread/pthread/jevent.cpp.o
[  1%] Building CXX object src/CMakeFiles/minetestserver.dir/jthread/pthread/jmutex.cpp.o
[  1%] Building CXX object src/CMakeFiles/minetestserver.dir/jthread/pthread/jsemaphore.cpp.o
[  1%] Building CXX object src/CMakeFiles/minetest.dir/jthread/pthread/jevent.cpp.o
/Users/adrian/Github/minetest-official/src/jthread/pthread/jsemaphore.cpp:70:24: error:
      use of undeclared identifier 'sem_timedwait'
        int sem_wait_retval = sem_timedwait(&m_semaphore,&waittime);
                              ^
1 error generated.
make[2]: *** [src/CMakeFiles/minetestserver.dir/jthread/pthread/jsemaphore.cpp.o] Error 1
make[1]: *** [src/CMakeFiles/minetestserver.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[  2%] [  2%] Building CXX object src/CMakeFiles/minetest.dir/jthread/pthread/jmutex.cpp.o
Building CXX object src/CMakeFiles/minetest.dir/jthread/pthread/jsemaphore.cpp.o
/Users/adrian/Github/minetest-official/src/jthread/pthread/jsemaphore.cpp:70:24: error:
      use of undeclared identifier 'sem_timedwait'
        int sem_wait_retval = sem_timedwait(&m_semaphore,&waittime);
                              ^
1 error generated.
make[2]: *** [src/CMakeFiles/minetest.dir/jthread/pthread/jsemaphore.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [src/CMakeFiles/minetest.dir/all] Error 2
make: *** [all] Error 2