@@ -218,11 +218,15 @@
 done
 
 __has_command vim && alias vi=vim
 __has_command gpg2 && alias gpg=gpg2
 
-__has_command nproc && export MAKEFLAGS="-j$(($(nproc) * 2))"
+if [ "$(uname -s)" = "Darwin" ]; then
+	export MAKEFLAGS="-j$(($(sysctl -n machdep.cpu.thread_count) * 2))"
+elif __has_command nproc; then
+	export MAKEFLAGS="-j$(($(nproc) * 2))"
+fi
 
 make() {
 	case "$PWD" in
 		# pkgsrc needs bmake and does not like MAKEFLAGS including -j.
 		*/pkgsrc*)