--- Makefile.orig	2021-07-09 11:41:34.859561000 +0100
+++ Makefile	2021-07-09 14:09:29.818251000 +0100
@@ -61,12 +61,16 @@
 
 PLIST_SUB=	TF_PORT_VERSION=${PORTVERSION}
 
-OPTIONS_DEFINE=		CPU_OPTS
+OPTIONS_DEFINE=		CPU_OPTS PARALLEL_JOBS
 
 CPU_OPTS_DESC=		Enable optimisations using features available on your CPU
 CPU_OPTS_VARS=		CPU_TARGET=native BAZEL_COPT="-c opt --copt=-march=native --copt=-mfpmath=sse"
 CPU_OPTS_VARS_OFF=	CPU_TARGET=x86-64
 
+PARALLEL_JOBS_DESC=		Enable parallel building
+PARALLEL_JOBS_VARS=		BAZEL_JOBS="--jobs $$(sysctl -n hw.ncpu)"
+PARALLEL_JOBS_VARS_OFF=		BAZEL_JOBS="--jobs 1"
+
 .include "Makefile.MASTER_SITES"
 
 post-patch:
@@ -134,7 +138,7 @@
 
 do-build:
 	@cd ${WRKSRC} && \
-		bazel --bazelrc="${WRKDIR}/bazelrc" ${BAZEL_BOOT} build --jobs 16 ${BAZEL_COPT} --host_copt="-I${LOCALBASE}/include" \
+		bazel --bazelrc="${WRKDIR}/bazelrc" ${BAZEL_BOOT} build ${BAZEL_JOBS} ${BAZEL_COPT} --host_copt="-I${LOCALBASE}/include" \
 		--host_linkopt="-L${LOCALBASE}/lib" --linkopt="-L${LOCALBASE}/lib" --config=c++17 --copt="-I${LOCALBASE}/include" \
 		--cxxopt="--std=c++1z" --verbose_failures -s \
 		--distdir=${WORKDIR}/bazel-dist \