diff --git a/NEWS b/NEWS
index 15ade88..9b64c27 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,10 @@ STILL UNDER DEVELOPMENT; NOT RELEASED YET.
 
 * Fixed option parsing to detect missing arguments to options.
 
+* Added support to build specific architectures within a machine type.
+  This is done via new syntax in the MACHINE variable, which can now
+  take pairs like evbarm-aarch64.
+
 
 Changes in version 2.7
 ======================
diff --git a/sysbuild.conf.5 b/sysbuild.conf.5
index e3cbc94..ce98eb1 100644
--- a/sysbuild.conf.5
+++ b/sysbuild.conf.5
@@ -25,7 +25,7 @@
 .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 .\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.Dd February 6, 2017
+.Dd December 31, 2024
 .Dt SYSBUILD.CONF 5
 .Os
 .Sh NAME
@@ -134,6 +134,12 @@ Default:
 .It Va MACHINES
 Whitespace-separated list of machine types to build for.
 .Pp
+Every entry in this list can be a simple machine name like
+.Sq amd64
+or it can be a pair of the form
+.Sq evbarm-aarch64
+to indicate the architecture to target for a particular machine type.
+.Pp
 Default: the name of the host machine type.
 .It Va MKVARS
 Whitespace-separated list of
diff --git a/sysbuild.sh b/sysbuild.sh
index 78196b5..9dece9a 100644
--- a/sysbuild.sh
+++ b/sysbuild.sh
@@ -78,11 +78,24 @@ sysbuild_set_defaults() {
 
 # Performs a build for a single machine type.
 #
-# \param machine The type of the machine to build for.
+# \param machine_pair The type of the machine to build for. Can optionally
+#    contain the architecture in the "machine-arch" form.
 do_one_build() {
-    local machine="${1}"; shift
+    local machine_pair="${1}"; shift
+
+    local aflag=
+    local mflag=
+    case "${machine_pair}" in
+        *-*)
+            mflag="-m${machine_pair%%-*}" # First word in pair.
+            aflag="-a${machine_pair#*-}" # Other words in pair.
+            ;;
+        *)
+            mflag="-m${machine_pair}"
+            ;;
+    esac
 
-    local basedir="$(shtk_config_get BUILD_ROOT)/${machine}"
+    local basedir="$(shtk_config_get BUILD_ROOT)/${machine_pair}"
 
     local njobs="$(shtk_config_get NJOBS)"
     local jflag=
@@ -147,7 +160,8 @@ do_one_build() {
         ${Vflags} \
         ${Xflag} \
         ${jflag} \
-        -m"${machine}" \
+        ${aflag} \
+        ${mflag} \
         ${uflag} \
         ${xflag} \
         ${targets} )
diff --git a/sysbuild_test.sh b/sysbuild_test.sh
index 060fefb..5561f07 100644
--- a/sysbuild_test.sh
+++ b/sysbuild_test.sh
@@ -378,6 +378,72 @@ EOF
 }
 
 
+shtk_unittest_add_test build__machine_arch_targets__ok
+build__machine_arch_targets__ok_test() {
+    mock_cvsroot=":local:$(pwd)/cvsroot"
+    create_mock_cvsroot "${mock_cvsroot}"
+
+    create_mock_binary cvs yes
+    PATH="$(pwd):${PATH}"
+
+    assert_command -o save:stdout -e save:stderr sysbuild \
+        -c /dev/null -o CVSROOT="${mock_cvsroot}" \
+        -o MACHINES="evbarm-aarch64 evbarm-earmv7hf fake-multi-dashes" \
+        -o NJOBS=2 build evbarm-aarch64:sets release
+
+    assert_file stdin commands.log <<EOF
+Command: cvs
+Directory: ${HOME}/sysbuild/src/.cvs-checkout
+Arg: -d${mock_cvsroot}
+Arg: -q
+Arg: checkout
+Arg: -P
+Arg: src
+
+Command: build.sh
+Directory: ${HOME}/sysbuild/src
+Arg: -D${HOME}/sysbuild/evbarm-aarch64/destdir
+Arg: -M${HOME}/sysbuild/evbarm-aarch64/obj
+Arg: -N2
+Arg: -R${HOME}/sysbuild/release
+Arg: -T${HOME}/sysbuild/evbarm-aarch64/tools
+Arg: -U
+Arg: -j2
+Arg: -aaarch64
+Arg: -mevbarm
+Arg: sets
+Arg: release
+
+Command: build.sh
+Directory: ${HOME}/sysbuild/src
+Arg: -D${HOME}/sysbuild/evbarm-earmv7hf/destdir
+Arg: -M${HOME}/sysbuild/evbarm-earmv7hf/obj
+Arg: -N2
+Arg: -R${HOME}/sysbuild/release
+Arg: -T${HOME}/sysbuild/evbarm-earmv7hf/tools
+Arg: -U
+Arg: -j2
+Arg: -aearmv7hf
+Arg: -mevbarm
+Arg: release
+
+Command: build.sh
+Directory: ${HOME}/sysbuild/src
+Arg: -D${HOME}/sysbuild/fake-multi-dashes/destdir
+Arg: -M${HOME}/sysbuild/fake-multi-dashes/obj
+Arg: -N2
+Arg: -R${HOME}/sysbuild/release
+Arg: -T${HOME}/sysbuild/fake-multi-dashes/tools
+Arg: -U
+Arg: -j2
+Arg: -amulti-dashes
+Arg: -mfake
+Arg: release
+
+EOF
+}
+
+
 shtk_unittest_add_test build__machine_targets__unmatched
 build__machine_targets__unmatched_test() {
     mock_cvsroot=":local:$(pwd)/cvsroot"
@@ -826,6 +892,22 @@ EOF
 }
 
 
+shtk_unittest_add_test env__explicit_machine_arch
+env__explicit_machine_arch_test() {
+    cat >expout <<EOF
+. "${SYSBUILD_SHAREDIR}/env.sh" ;
+PATH="/my/root/evbarm-aarch64/tools/bin:\${PATH}"
+D="/my/root/evbarm-aarch64/destdir"
+O="/my/root/evbarm-aarch64/obj/usr/src"
+S="/usr/src"
+T="/my/root/evbarm-aarch64/tools"
+EOF
+    assert_command -s exit:0 -o file:expout sysbuild -c /dev/null \
+        -o BUILD_ROOT=/my/root -o MACHINES="amd64 evbarm evbarm:aarch64 i386" \
+        -o SRCDIR=/usr/src env evbarm-aarch64
+}
+
+
 shtk_unittest_add_test env__eval
 env__eval_test() {
     make_one() {