diff --git a/.github/workflows/ubuntu-main.yml b/.github/workflows/ubuntu-main.yml
index 260a8310..4b5f22cd 100644
--- a/.github/workflows/ubuntu-main.yml
+++ b/.github/workflows/ubuntu-main.yml
@@ -114,6 +114,41 @@ jobs:
 
     # ----------------------------------------------------------------
 
+    - name: clone xo-randomgen
+      uses: actions/checkout@v3
+      with:
+        repository: Rconybea/randomgen
+        path: repo/xo-randomgen
+
+    - name: build xo-randomgen
+      run: |
+        XONAME=xo-randomgen
+        XOSRC=repo/${XONAME}
+        BUILDDIR=${{github.workspace}}/build_${XONAME}
+        PREFIX=${{github.workspace}}/local
+
+        echo "::group::repo dir tree"
+        tree -L 2 repo
+        echo "::endgroup"
+
+        echo "::group::configure ${XONAME}"
+        cmake -B ${BUILDDIR} -DCMAKE_INSTALL_PREFIX=${PREFIX} ${XOSRC}
+        echo "::endgroup"
+
+        echo "::group::compile ${XONAME}"
+        cmake --build ${BUILDDIR} --config ${{env.BUILD_TYPE}} -j
+        echo "::endgroup"
+
+        echo "::group::local install ${XONAME}"
+        cmake --install ${BUILDDIR}
+        echo "::endgroup"
+
+        echo "::group::local dir tree"
+        tree -L 3 ${PREFIX}
+        echo "::endgroup"
+
+    # ----------------------------------------------------------------
+
     - name: clone xo-flatstring
       uses: actions/checkout@v3
       with:
diff --git a/README.md b/README.md
index 5b6dda3a..a5047565 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,9 @@ Relative to `boost::ratio`:
 ### install dependencies
 
 - [github/Rconybea/xo-cmake](https://github.com/Rconybea/xo-cmake) cmake macros
-- [github/rconybea/xo-indentlog](https://github.com/Rconybea/xo-indentlog) logging (used by unit tests)
 - [github/Rconybea/xo-flatstring](https://github.com/Rconybea/xo-flatstring) fixed-capacity strings
+- [github/rconybea/xo-indentlog](https://github.com/Rconybea/xo-indentlog) logging (used by unit tests)
+- [github/rconybea/xo-randomgen](https://github.com/Rconybea/xo-randomgen) rng (used by unit tests)
 
 ### clone xo-ratio