Building with make -j can cause system crashes

[bisen2]

Building with make -j as recommended in the docs is generally inadvisable. It steals all the threads it can and will cause crashes on some systems. It would be better to run make -j $(($(nproc)/2)) for linux or $(($(sysctl -n hw.ncpu)/2)) for mac if you want to speed up your build time by multithreading.

[asmuth]

Fixed. Thanks for pointing out the problem!