internal/rosa: autoconf artifact

Required by git to reconfigure some options.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/gnu.go

@@ -47,3 +47,28 @@ make DESTDIR=/work install
 	)))
 
 }
+
+// NewAutoconf returns a [pkg.Artifact] containing an installation of GNU Autoconf.
+func (t Toolchain) NewAutoconf() pkg.Artifact {
+	const (
+		version  = "2.72"
+		checksum = "-c5blYkC-xLDer3TWEqJTyh1RLbOd1c5dnRLKsDnIrg_wWNOLBpaqMY8FvmUFJ33"
+	)
+	return t.New("autoconf-"+version, []pkg.Artifact{
+		t.NewMake(),
+		t.NewM4(),
+		t.NewPerl(),
+	}, nil, nil, `
+cd "$(mktemp -d)"
+/usr/src/autoconf/configure \
+	--prefix=/system \
+	--build="${ROSA_TRIPLE}"
+make "-j$(nproc)"
+make DESTDIR=/work install
+`, pkg.Path(AbsUsrSrc.Append("autoconf"), false, pkg.NewHTTPGetTar(
+		nil,
+		"https://ftp.gnu.org/gnu/autoconf/autoconf-"+version+".tar.gz",
+		mustDecode(checksum),
+		pkg.TarGzip,
+	)))
+}