diff --git a/internal/rosa/cmake.go b/internal/rosa/cmake.go
index 10b2afc0..127423d1 100644
--- a/internal/rosa/cmake.go
+++ b/internal/rosa/cmake.go
@@ -6,7 +6,10 @@ import (
 	"strings"
 )
 
-var _cmake = H("cmake")
+var (
+	_cmake = H("cmake")
+	_ninja = H("ninja")
+)
 
 // CMakeHelper is the [CMake] build system helper.
 type CMakeHelper struct {
diff --git a/internal/rosa/ninja.go b/internal/rosa/ninja.go
deleted file mode 100644
index 74f82998..00000000
--- a/internal/rosa/ninja.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package rosa
-
-import "hakurei.app/internal/pkg"
-
-var _ninja = H("ninja")
-
-func init() {
-	const (
-		version  = "1.13.2"
-		checksum = "ygKWMa0YV2lWKiFro5hnL-vcKbc_-RACZuPu0Io8qDvgQlZ0dxv7hPNSFkt4214v"
-	)
-	meta := Metadata{
-		Name:        "ninja",
-		Description: "a small build system with a focus on speed",
-		Website:     "https://ninja-build.org",
-		Version:     version,
-
-		ID: 2089,
-	}
-	native.MustRegister(meta.Name, func(t Toolchain) (*Metadata, pkg.Artifact) {
-		_, python := t.Load(_python)
-		_, bash := t.Load(_bash)
-		return &meta, t.New(meta.Name+"-"+version, 0, []pkg.Artifact{
-			python,
-			bash,
-		}, nil, nil, `
-cd "$(mktemp -d)"
-python3 /usr/src/ninja/configure.py \
-	--verbose \
-	--bootstrap \
-	--gtest-source-dir=/usr/src/googletest
-./ninja `+jobsFlagE+` all
-./ninja_test
-
-mkdir -p /work/system/bin/
-cp ninja /work/system/bin/
-`, pkg.Path(AbsUsrSrc.Append("googletest"), false,
-			newFromGitHubRelease(
-				"google/googletest",
-				"v1.16.0",
-				"googletest-1.16.0.tar.gz",
-				"NjLGvSbgPy_B-y-o1hdanlzEzaYeStFcvFGxpYV3KYlhrWWFRcugYhM3ZMzOA9B_",
-				pkg.TarGzip,
-			)), pkg.Path(AbsUsrSrc.Append("ninja"), true, t.NewPatchedSource(
-			meta.Name+"-"+version, newFromGitHub(
-				"ninja-build/ninja",
-				"v"+version,
-				checksum,
-			), false,
-		)))
-	})
-}
diff --git a/internal/rosa/package/googletest.az b/internal/rosa/package/googletest.az
new file mode 100644
index 00000000..e7cee75f
--- /dev/null
+++ b/internal/rosa/package/googletest.az
@@ -0,0 +1,14 @@
+package googletest {
+	description = "Google Testing and Mocking Framework";
+	exclude = true;
+	anitya = 18290;
+
+	version* = "1.16.0";
+	output = remoteGitHubRelease {
+		suffix = "google/googletest";
+		tag = "v"+version;
+		name = "googletest-"+version+".tar.gz";
+		checksum = "NjLGvSbgPy_B-y-o1hdanlzEzaYeStFcvFGxpYV3KYlhrWWFRcugYhM3ZMzOA9B_";
+		compress = gzip;
+	};
+}
diff --git a/internal/rosa/package/ninja.az b/internal/rosa/package/ninja.az
new file mode 100644
index 00000000..32cf8375
--- /dev/null
+++ b/internal/rosa/package/ninja.az
@@ -0,0 +1,34 @@
+package ninja {
+	description = "a small build system with a focus on speed";
+	website = "https://ninja-build.org";
+	anitya = 2089;
+
+	version* = "1.13.2";
+	source = remoteGitHub {
+		suffix = "ninja-build/ninja";
+		tag = "v"+version;
+		checksum = "ygKWMa0YV2lWKiFro5hnL-vcKbc_-RACZuPu0Io8qDvgQlZ0dxv7hPNSFkt4214v";
+	};
+	extra = [ googletest ];
+
+	exec = generic {
+		build = `
+python3 /usr/src/ninja/configure.py \
+	--verbose \
+	--bootstrap
+python3 /usr/src/ninja/configure.py \
+	--gtest-source-dir=/usr/src/extra/googletest
+./ninja ` + jobsFlagE + ` all`;
+
+		check = "\n./ninja_test";
+
+		install = `
+mkdir -p /work/system/bin/
+cp ninja /work/system/bin/`;
+	};
+
+	inputs = [
+		python,
+		bash,
+	];
+}