diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 0b6387ed..69c80597 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -147,6 +147,44 @@ jobs:
       - name: test
         run: yarn run test:lint
 
+  test-licenses:
+    needs: [ 'build' ]
+    name: test licenses
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: install flict
+        run: pip install flict
+      - name: Checkout
+        # see https://github.com/actions/checkout
+        uses: actions/checkout@v4
+      - name: Setup Node.js ${{ env.NODE_ACTIVE_LTS }}
+        # see https://github.com/actions/setup-node
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_ACTIVE_LTS }}
+          # cache: 'yarn'
+      - name: Setup yarn ${{ env.YARN_VERSION }}
+        run: |
+          corepack enable yarn
+          yarn set version ${{ env.YARN_VERSION }}
+      - name: Setup subject
+        run: |
+          yarn install --no-immutable
+          yarn info --name-only --recursive
+      - name: fetch build artifact
+        # see https://github.com/actions/download-artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: ${{ env.BUNDLES_DIR }}
+          path: ${{ env.BUNDLES_DIR }}
+      - name: make NOTICE and summary
+        run: |
+          mkdir -p _tmp
+          yarn node tools/write-3rd-party-licenses.cjs _tmp/NOTICE _tmp/lsummary
+      - name: test license compatibility
+        run: flict display-compatibility $(cat _tmp/lsummary)
+
   test-node:
     needs: [ 'build' ]
     name: test (node${{ matrix.node-version }} ${{ matrix.os }})
diff --git a/.gitignore b/.gitignore
index 2c7bd58a..2d522963 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,7 +10,7 @@
 /dist/
 /release_assets/
 
-
+_tmp/
 
 # yarn stuff - for now, until setup is hardened
 # see also: https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored