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diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -530,14 +530,10 @@
# powerpcspe excluded from main list until clang fixed
EXTRA_ARCHES_powerpc= powerpcspe
.endif
-TARGETS?=amd64 arm arm64 i386 powerpc riscv
+TARGETS?= ${TARGET_MACHINE_LIST}
_UNIVERSE_TARGETS= ${TARGETS}
-TARGET_ARCHES_arm?= armv6 armv7
-TARGET_ARCHES_arm64?= aarch64
-TARGET_ARCHES_powerpc?= powerpc powerpc64 powerpc64le ${EXTRA_ARCHES_powerpc}
-TARGET_ARCHES_riscv?= riscv64
.for target in ${TARGETS}
-TARGET_ARCHES_${target}?= ${target}
+TARGET_ARCHES_${target}= ${MACHINE_ARCH_LIST_${target}}
.endfor
.if defined(USE_GCC_TOOLCHAINS)
diff --git a/share/mk/local.sys.dirdeps.env.mk b/share/mk/local.sys.dirdeps.env.mk
--- a/share/mk/local.sys.dirdeps.env.mk
+++ b/share/mk/local.sys.dirdeps.env.mk
@@ -12,41 +12,17 @@
${.MAKE.DEPENDFILE_PREFIX}.${MACHINE} \
${.MAKE.DEPENDFILE_PREFIX}
-# before we process TARGET_SPEC
-# we assume that MK_DIRDEPS_BUILD=yes
-
-# from src/Makefile (for universe)
-# would be nice to have this sort of info in sys.machine.mk
-TARGET_ARCHES_arm?= armv6 armv7
-TARGET_ARCHES_arm64?= aarch64
-TARGET_ARCHES_powerpc?= powerpc powerpc64 powerpc64le powerpcspe
-TARGET_ARCHES_riscv?= riscv64
-
# some corner cases
BOOT_MACHINE_DIR.amd64 = boot/i386
-MACHINE_ARCH.host = ${_HOST_ARCH}
-
-# the list of machines we support
-ALL_MACHINE_LIST?= amd64 arm arm64 i386 powerpc riscv
.-include <site.sys.dirdeps.env.mk>
-.for m in ${ALL_MACHINE_LIST:O:u}
-MACHINE_ARCH_LIST.$m?= ${TARGET_ARCHES_${m}:U$m}
-MACHINE_ARCH.$m?= ${MACHINE_ARCH_LIST.$m:[1]}
+ALL_MACHINE_LIST?= ${TARGET_MACHINE_LIST}
+
+.for m in ${TARGET_MACHINE_LIST:O:u}
BOOT_MACHINE_DIR.$m ?= boot/$m
.endfor
-.if empty(MACHINE_ARCH)
-.if !empty(TARGET_ARCH)
-MACHINE_ARCH= ${TARGET_ARCH}
-.else
-MACHINE_ARCH= ${MACHINE_ARCH.${MACHINE}}
-.endif
-.endif
-MACHINE_ARCH?= ${MACHINE_ARCH.${MACHINE}}
-MACHINE_ARCH:= ${MACHINE_ARCH}
-
HOST_OBJTOP ?= ${OBJROOT}${HOST_TARGET}
.if ${REQUESTED_MACHINE:U${MACHINE}} == "host"
@@ -58,7 +34,7 @@
.endif
.if ${MACHINE} == "host"
OBJTOP := ${HOST_OBJTOP}
-MACHINE_ARCH= ${MACHINE_ARCH.${MACHINE}}
+MACHINE_ARCH= ${MACHINE_ARCH_${MACHINE}}
.endif
diff --git a/share/mk/local.sys.env.mk b/share/mk/local.sys.env.mk
--- a/share/mk/local.sys.env.mk
+++ b/share/mk/local.sys.env.mk
@@ -56,3 +56,5 @@
.include <host-target.mk>
.export HOST_TARGET
.endif
+
+.include <sys.machine.mk>
diff --git a/share/mk/sys.machine.mk b/share/mk/sys.machine.mk
new file mode 100644
--- /dev/null
+++ b/share/mk/sys.machine.mk
@@ -0,0 +1,23 @@
+
+.-include <local.sys.machine.mk>
+
+PSEUDO_MACHINE_LIST?= common host
+TARGET_MACHINE_LIST?= amd64 arm arm64 i386 powerpc riscv
+
+MACHINE_ARCH_host?= ${_HOST_ARCH}
+
+MACHINE_ARCH_LIST_arm?= armv6 armv7
+MACHINE_ARCH_LIST_arm64?= aarch64
+MACHINE_ARCH_LIST_powerpc?= powerpc powerpc64 powerpc64le ${EXTRA_ARCHES_powerpc}
+MACHINE_ARCH_LIST_riscv?= riscv64
+
+.for m in ${TARGET_MACHINE_LIST}
+MACHINE_ARCH_LIST_$m?= $m
+MACHINE_ARCH_$m?= ${MACHINE_ARCH_LIST_$m:[1]}
+# for backwards comatability
+MACHINE_ARCH.$m?= ${MACHINE_ARCH_$m}
+.endfor
+
+.if empty(MACHINE_ARCH)
+MACHINE_ARCH:= ${MACHINE_ARCH_${MACHINE}}
+.endif

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