diff --git a/internal/rosa/mksh.go b/internal/rosa/mksh.go
deleted file mode 100644
index 26392d6c..00000000
--- a/internal/rosa/mksh.go
+++ /dev/null
@@ -1,46 +0,0 @@
-package rosa
-
-import "hakurei.app/internal/pkg"
-
-func (t Toolchain) newMksh() (pkg.Artifact, string) {
-	const (
-		version  = "59c"
-		checksum = "0Zj-k4nXEu3IuJY4lvwD2OrC2t27GdZj8SPy4DoaeuBRH1padWb7oREpYgwY8JNq"
-	)
-	scriptTest := "./test.sh -C regress:no-ctty\n"
-	if t.opts&OptSkipCheck != 0 {
-		scriptTest = ""
-	}
-	return t.New("mksh-"+version, 0, t.Append(nil,
-		Perl,
-		Coreutils,
-	), nil, []string{
-		"LDSTATIC=-static",
-		"CPPFLAGS=-DMKSH_DEFAULT_PROFILEDIR=\\\"/system/etc\\\"",
-	}, `
-cd "$(mktemp -d)"
-sh /usr/src/mksh/Build.sh -r
-CPPFLAGS="${CPPFLAGS} -DMKSH_BINSHPOSIX -DMKSH_BINSHREDUCED" \
-sh /usr/src/mksh/Build.sh -r -L
-`+scriptTest+`
-mkdir -p /work/system/bin/
-cp -v mksh /work/system/bin/
-cp -v lksh /work/system/bin/sh
-
-mkdir -p /work/bin/
-ln -vs ../system/bin/sh /work/bin/
-`, pkg.Path(AbsUsrSrc.Append("mksh"), false, newTar(
-		"https://mbsd.evolvis.org/MirOS/dist/mir/mksh/mksh-R"+version+".tgz",
-		checksum,
-		pkg.TarGzip,
-	))), version
-}
-func init() {
-	native.mustRegister(Toolchain.newMksh, &Metadata{
-		Name:        "mksh",
-		Description: "MirBSD Korn Shell",
-		Website:     "https://www.mirbsd.org/mksh",
-
-		ID: 5590,
-	})
-}
diff --git a/internal/rosa/package/mksh.az b/internal/rosa/package/mksh.az
new file mode 100644
index 00000000..21911196
--- /dev/null
+++ b/internal/rosa/package/mksh.az
@@ -0,0 +1,40 @@
+package mksh {
+	description = "MirBSD Korn Shell";
+	website = "https://www.mirbsd.org/mksh";
+	anitya = 5590;
+
+	version* = "59c";
+	source = remoteTar {
+		url = "https://mbsd.evolvis.org/MirOS/dist/mir/mksh/mksh-R"+version+".tgz";
+		checksum = "0Zj-k4nXEu3IuJY4lvwD2OrC2t27GdZj8SPy4DoaeuBRH1padWb7oREpYgwY8JNq";
+		compress = gzip;
+	};
+
+	env = [
+		"LDSTATIC=-static",
+		"CPPFLAGS=-DMKSH_DEFAULT_PROFILEDIR=\\\"/system/etc\\\"",
+	];
+
+	exec = generic {
+		mktemp = true;
+
+		build = `sh /usr/src/mksh/Build.sh -r
+CPPFLAGS="${CPPFLAGS} -DMKSH_BINSHPOSIX -DMKSH_BINSHREDUCED" \
+sh /usr/src/mksh/Build.sh -r -L
+`;
+		check = "./test.sh -C regress:no-ctty\n";
+		install = `
+mkdir -p /work/system/bin/
+cp -v mksh /work/system/bin/
+cp -v lksh /work/system/bin/sh
+
+mkdir -p /work/bin/
+ln -vs ../system/bin/sh /work/bin/
+`;
+	};
+
+	inputs = [
+		perl,
+		coreutils,
+	];
+}
diff --git a/internal/rosa/rosa.go b/internal/rosa/rosa.go
index 584678f5..70a6c9b1 100644
--- a/internal/rosa/rosa.go
+++ b/internal/rosa/rosa.go
@@ -224,6 +224,9 @@ const (
 	THostNet
 )
 
+// The Mksh shell is added by [Toolchain.New] and used by almost all packages.
+var Mksh = H("mksh")
+
 // New returns a [pkg.Artifact] based on a [Toolchain] via s.
 func (t Toolchain) New(
 	name string,
diff --git a/internal/rosa/state_native.go b/internal/rosa/state_native.go
index 14e343de..31297d1e 100644
--- a/internal/rosa/state_native.go
+++ b/internal/rosa/state_native.go
@@ -102,7 +102,6 @@ var (
 	MPC                 = H("mpc")
 	MPFR                = H("mpfr")
 	Mesa                = H("mesa")
-	Mksh                = H("mksh")
 	MuslFts             = H("musl-fts")
 	MuslObstack         = H("musl-obstack")
 	NSS                 = H("nss")