From bc0ee0b54dd4dde15c10c81bd8cade3bd6d5d9d7 Mon Sep 17 00:00:00 2001
From: Alex Jurkiewicz <alex@jurkiewi.cz>
Date: Fri, 29 Mar 2019 00:26:08 +1100
Subject: [PATCH] feat: Auto-detect number of processors (#1970)

In case anyone is building on FreeBSD or another unsupported OS, leave
the default at four.
---
 Makefile | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index c82c016ae..791c69a31 100644
--- a/Makefile
+++ b/Makefile
@@ -12,12 +12,22 @@ DEBUG=${ALL_DEBUG}
 #export EXTRALINK
 export MAKE
 export CURVER?=2.0.4
-export MAKEOPT=-j 4
 ifneq (,$(wildcard /etc/os-release))
 	DISTRO := $(shell gawk -F= '/^NAME/{print $$2}' /etc/os-release)
 else
-	DISTRO := unknown
+	DISTRO := Unknown
 endif
+
+NPROCS := 4
+OS := $(shell uname -s)
+ifeq ($(OS),Linux)
+	NPROCS := $(shell nproc)
+endif
+ifeq ($(OS),Darwin)
+	NPROCS := $(shell sysctl -n hw.ncpu)
+endif
+export MAKEOPT=-j ${NPROCS}
+
 ifeq ($(wildcard /usr/lib/systemd/system), /usr/lib/systemd/system)
 	SYSTEMD=1
 else