1 files changed, 1 insertions, 0 deletions
diff --git a/rules.mk b/rules.mk
index b140fbca70..f1ca735f2e 100644
--- a/rules.mk
+++ b/rules.mk
@@ -70,6 +70,7 @@ TARGET_SUFFIX=$(call qstrip,$(CONFIG_TARGET_SUFFIX))
 BUILD_SUFFIX:=$(call qstrip,$(CONFIG_BUILD_SUFFIX))
 SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
 BUILD_SUBDIR:=$(patsubst $(TOPDIR)/%,%,${CURDIR})
+NPROC:=$(shell sysctl -n hw.ncpu 2>/dev/null || nproc)
 export SHELL:=/usr/bin/env bash
 
 IS_PACKAGE_BUILD := $(if $(filter package/%,$(BUILD_SUBDIR)),1)