+export SYSCTL_HW_PHYSICALCPU := $(shell /usr/sbin/sysctl -n hw.physicalcpu)
+export SYSCTL_HW_LOGICALCPU := $(shell /usr/sbin/sysctl -n hw.logicalcpu)
+ifeq ($(SYSCTL_HW_PHYSICALCPU),$(SYSCTL_HW_LOGICALCPU))
+MAKEJOBS := --jobs=$(shell expr $(SYSCTL_HW_PHYSICALCPU) + 1)
+else
+MAKEJOBS := --jobs=$(SYSCTL_HW_LOGICALCPU)
+endif
+