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-rw-r--r--share/mk/sys.mk4
1 files changed, 3 insertions, 1 deletions
diff --git a/share/mk/sys.mk b/share/mk/sys.mk
index 1449d9937007..11d600291d02 100644
--- a/share/mk/sys.mk
+++ b/share/mk/sys.mk
@@ -101,8 +101,10 @@ YFLAGS ?= -d
# which knows MACHINE, but not MACHINE_ARCH. When building on other
# architectures, assume that the version of make being used has an
# explicit MACHINE_ARCH setting and treat a missing MACHINE_ARCH
-# as an i386 architecture.
+# as an i386 architecture. Similarly for MACHINE_CPU, which indicates
+# the specific CPU generation to use, for optimization purposes.
MACHINE_ARCH ?= i386
+MACHINE_CPU ?= i386
# For tags rule.
GTAGSFLAGS= -o