Index: bsd.port.mk
===================================================================
--- bsd.port.mk	(revision 322828)
+++ bsd.port.mk	(working copy)
@@ -907,6 +907,9 @@
 #				  that are explicitly marked MAKE_JOBS_UNSAFE.  User settable.
 # MAKE_JOBS_NUMBER
 #				- Override the number of make jobs to be used.  User settable.
+# MAKE_JOBS_NUMBER_LIMIT
+#				- Set a limit for maximum number of make jobs allowed to be
+#				  used.
 ## cacche
 #
 # WITH_CCACHE_BUILD
@@ -2146,7 +2149,12 @@
 _MAKE_JOBS=		#
 .else
 .if defined(MAKE_JOBS_SAFE) || defined(FORCE_MAKE_JOBS)
-MAKE_JOBS_NUMBER?=	`${SYSCTL} -n kern.smp.cpus`
+_MAKE_JOBS_NUMBER!=	${SYSCTL} -n kern.smp.cpus
+.if defined(MAKE_JOBS_NUMBER_LIMIT) && (${MAKE_JOBS_NUMBER_LIMIT} < ${_MAKE_JOBS_NUMBER})
+MAKE_JOBS_NUMBER?=	${MAKE_JOBS_NUMBER_LIMIT}
+.else
+MAKE_JOBS_NUMBER?=	${_MAKE_JOBS_NUMBER}
+.endif
 _MAKE_JOBS?=		-j${MAKE_JOBS_NUMBER}
 .if defined(FORCE_MAKE_JOBS) && !defined(MAKE_JOBS_SAFE)
 BUILD_FAIL_MESSAGE+=	You have chosen to use multiple make jobs (parallelization) for all ports.  This port was not tested for this setting.  Please remove FORCE_MAKE_JOBS and retry the build before reporting the failure to the maintainer.