diff --git a/internal/rosa/ninja.go b/internal/rosa/ninja.go
new file mode 100644
index 0000000..4cdef7a
--- /dev/null
+++ b/internal/rosa/ninja.go
@@ -0,0 +1,35 @@
+package rosa
+
+import "hakurei.app/internal/pkg"
+
+// NewNinja returns a [pkg.Artifact] containing an installation of Ninja.
+func (t Toolchain) NewNinja() pkg.Artifact {
+	const (
+		version  = "1.13.2"
+		checksum = "ygKWMa0YV2lWKiFro5hnL-vcKbc_-RACZuPu0Io8qDvgQlZ0dxv7hPNSFkt4214v"
+	)
+	return t.New("ninja-"+version, []pkg.Artifact{
+		t.NewCMake(),
+		t.NewPython(),
+	}, nil, nil, `
+chmod -R +w /usr/src/ninja/
+mkdir -p /work/system/bin/ && cd /work/system/bin/
+python3 /usr/src/ninja/configure.py \
+	--bootstrap \
+	--gtest-source-dir=/usr/src/googletest
+./ninja all
+./ninja_test
+`, pkg.Path(AbsUsrSrc.Append("googletest"), false,
+		pkg.NewHTTPGetTar(
+			nil, "https://github.com/google/googletest/releases/download/"+
+				"v1.16.0/googletest-1.16.0.tar.gz",
+			mustDecode("NjLGvSbgPy_B-y-o1hdanlzEzaYeStFcvFGxpYV3KYlhrWWFRcugYhM3ZMzOA9B_"),
+			pkg.TarGzip,
+		)), pkg.Path(AbsUsrSrc.Append("ninja"), true,
+		pkg.NewHTTPGetTar(
+			nil, "https://github.com/ninja-build/ninja/archive/refs/tags/"+
+				"v"+version+".tar.gz",
+			mustDecode(checksum),
+			pkg.TarGzip,
+		)))
+}