diff --git a/extra/mdevd/build b/extra/mdevd/build
new file mode 100755
index 00000000..1b5d070e
--- /dev/null
+++ b/extra/mdevd/build
@@ -0,0 +1,31 @@
+#!/bin/sh -e
+
+mkdir -p junk
+
+(
+    cd skalibs
+
+    ./configure \
+        --prefix=/usr \
+        --disable-shared
+
+    make
+    make DESTDIR="$PWD/../junk" install
+)
+
+./configure \
+    --prefix=/usr \
+    --enable-static-libc \
+    --disable-shared \
+    --with-sysdeps="$PWD/junk/usr/lib/skalibs/sysdeps" \
+    --with-lib="$PWD/junk/usr/lib/skalibs" \
+    --with-include="$PWD/junk/usr/include"
+
+make
+make install
+
+mkdir -p "$1/etc/sv/mdevd"
+cp -f mdevd.conf "$1/etc"
+cp -f mdevd.run  "$1/etc/sv/mdevd"
+ln -sf "/run/runit/supervise.mdevd" "$1/etc/sv/mdevd/supervise"
+rm -rf "$1/usr/include"
diff --git a/extra/mdevd/checksums b/extra/mdevd/checksums
new file mode 100644
index 00000000..cdd2eda7
--- /dev/null
+++ b/extra/mdevd/checksums
@@ -0,0 +1,4 @@
+ffd3b223b4cf0e51253b4a8f09cb88d70bf22693228ab0818af174a3f099dcd2
+b780b0ae650dda0c3ec5f8975174998af2d24c2a2e2be669b1bab46e73b1464d
+d021224bb87c30b73efcd302610af50a3e30f22b7521343eb295b5a3770c73d6
+b3e6b95eaa9899939b96bfab6a8d982b15a1e04e9d12c272b83aed28c1305029
diff --git a/extra/mdevd/files/mdevd.conf b/extra/mdevd/files/mdevd.conf
new file mode 120000
index 00000000..7b807a1d
--- /dev/null
+++ b/extra/mdevd/files/mdevd.conf
@@ -0,0 +1 @@
+../../../core/busybox/files/mdev.conf
\ No newline at end of file
diff --git a/extra/mdevd/files/mdevd.run b/extra/mdevd/files/mdevd.run
new file mode 100644
index 00000000..47d2d8fd
--- /dev/null
+++ b/extra/mdevd/files/mdevd.run
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Null the legacy hotplugger as the service will take over from here.
+printf '\n' 2>/dev/null > /proc/sys/kernel/hotplug
+
+exec mdevd -f /etc/mdevd.conf
diff --git a/extra/mdevd/sources b/extra/mdevd/sources
new file mode 100644
index 00000000..4ab2c55c
--- /dev/null
+++ b/extra/mdevd/sources
@@ -0,0 +1,4 @@
+https://skarnet.org/software/mdevd/mdevd-0.1.4.0.tar.gz
+https://skarnet.org/software/skalibs/skalibs-2.10.0.3.tar.gz skalibs
+files/mdevd.conf
+files/mdevd.run
diff --git a/extra/mdevd/version b/extra/mdevd/version
new file mode 100644
index 00000000..39632504
--- /dev/null
+++ b/extra/mdevd/version
@@ -0,0 +1 @@
+0.1.4.0 1