Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -1168,6 +1168,8 @@
 buildworld: buildworld_prologue ${WMAKE_TGTS} buildworld_epilogue .PHONY
 .ORDER: buildworld_prologue ${WMAKE_TGTS} buildworld_epilogue
 
+_ncpu_cmd=sysctl -n hw.ncpu 2>/dev/null || nproc 2>/dev/null || echo unknown
+
 buildworld_prologue: .PHONY
 	@echo "--------------------------------------------------------------"
 	@echo ">>> World build started on `LC_ALL=C date`"
@@ -1179,7 +1181,7 @@
 	@echo ">>> World build completed on `LC_ALL=C date`"
 	@seconds=$$(($$(date '+%s') - ${_BUILDWORLD_START})); \
 	  echo -n ">>> World built in $$seconds seconds, "; \
-	  echo "ncpu: $$(sysctl -n hw.ncpu)${.MAKE.JOBS:S/^/, make -j/}"
+	  echo "ncpu: $$(${_ncpu_cmd})${.MAKE.JOBS:S/^/, make -j/}"
 	@echo "--------------------------------------------------------------"
 
 #
@@ -1694,7 +1696,7 @@
 .endfor
 	@seconds=$$(($$(date '+%s') - ${_BUILDKERNEL_START})); \
 	  echo -n ">>> Kernel(s) ${BUILDKERNELS} built in $$seconds seconds, "; \
-	  echo "ncpu: $$(sysctl -n hw.ncpu)${.MAKE.JOBS:S/^/, make -j/}"
+	  echo "ncpu: $$(${_ncpu_cmd})${.MAKE.JOBS:S/^/, make -j/}"
 	@echo "--------------------------------------------------------------"
 
 NO_INSTALLEXTRAKERNELS?=	yes