diff --git a/internal/rosa/perl.go b/internal/rosa/perl.go
index 93dc0de1..f321b20d 100644
--- a/internal/rosa/perl.go
+++ b/internal/rosa/perl.go
@@ -10,50 +10,38 @@ import (
 // Perl is the perl interpreter used by [MakeMakerHelper].
 var Perl = H("perl")
 
-// newViaPerlModuleBuild installs a perl module via Build.PL.
-func (t Toolchain) newViaPerlModuleBuild(
-	name, version string,
-	source pkg.Artifact,
-	patches []KV,
-	extra ...ArtifactH,
-) pkg.Artifact {
-	if name == "" || version == "" {
-		panic("names must be non-empty")
-	}
-	return t.New("perl-"+name, 0, t.Append(nil,
-		slices.Concat(P{Perl}, extra)...,
-	), nil, nil, `
-cd /usr/src/`+name+`
-perl Build.PL --prefix=/system
-./Build build
-./Build test
-./Build install --destdir=/work
-`, pkg.Path(AbsUsrSrc.Append(name), true, t.NewPatchedSource(
-		"perl-"+name, version, source, false, patches...,
-	)))
-}
-
-func (t Toolchain) newPerlModuleBuild() (pkg.Artifact, string) {
+func init() {
 	const (
 		version  = "0.4234"
 		checksum = "ZKxEFG4hE1rqZt52zBL2LRZBMkYzhjb5-cTBXcsyA52EbPeeYyVxU176yAea8-Di"
 	)
-	return t.newViaPerlModuleBuild("Module-Build", version, newTar(
-		"https://cpan.metacpan.org/authors/id/L/LE/LEONT/"+
-			"Module-Build-"+version+".tar.gz",
-		checksum,
-		pkg.TarGzip,
-	), nil), version
-}
-func init() {
-	native.mustRegister(Toolchain.newPerlModuleBuild, &Metadata{
+	meta := Metadata{
 		Name:        "perl-Module::Build",
 		Description: "build and install Perl modules",
 		Website:     "https://metacpan.org/release/Module-Build",
+		Version:     version,
 
 		Dependencies: P{
 			Perl,
 		},
+	}
+	native.MustRegister(meta.Name, func(t Toolchain) (*Metadata, pkg.Artifact) {
+		return &meta, t.New(meta.Name, 0, t.Append(nil,
+			Perl,
+		), nil, nil, `
+cd /usr/src/Module-Build
+perl Build.PL --prefix=/system
+./Build build
+./Build test
+./Build install --destdir=/work
+`, pkg.Path(AbsUsrSrc.Append("Module-Build"), true, t.NewPatchedSource(
+			meta.Name, version, newFromCPAN(
+				"LEONT",
+				"Module-Build",
+				version,
+				checksum,
+			), false,
+		)))
 	})
 }