Index: head/Makefile
===================================================================
--- head/Makefile
+++ head/Makefile
@@ -483,16 +483,17 @@
 .if make(universe) || make(universe_kernels) || make(tinderbox) || \
     make(targets) || make(universe-toolchain)
 #
-# Always build architectures supported by clang.  Only build architectures
-# only supported by GCC if a suitable toolchain is present or enabled.
-# In all cases, if the user specifies TARGETS on the command line,
-# honor that most of all.
+# Don't build rarely used architectures unless requested.
 #
+.if defined(EXTRA_TARGETS)
+EXTRA_ARCHES_mips=	mipsel mipshf mipselhf mips64el mips64hf mips64elhf
+EXTRA_ARCHES_mips+=	mipsn32
+.endif
 TARGETS?=amd64 arm arm64 i386 mips powerpc riscv
 _UNIVERSE_TARGETS=	${TARGETS}
 TARGET_ARCHES_arm?=	armv6 armv7
 TARGET_ARCHES_arm64?=	aarch64
-TARGET_ARCHES_mips?=	mipsel mips mips64el mips64 mipsn32 mipselhf mipshf mips64elhf mips64hf
+TARGET_ARCHES_mips?=	mips mips64 ${EXTRA_ARCHES_mips}
 # powerpcspe excluded until clang fixed
 TARGET_ARCHES_powerpc?=	powerpc powerpc64
 TARGET_ARCHES_riscv?=	riscv64 riscv64sf