diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index c6a45deb..d951976f 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -32,6 +32,7 @@ jobs:
       run: |
         # Public runners come with 2 CPUs.
         make -j2
+        make -j2 ref_gles1
     - name: Create testbuild package
       run: |
         # Create release directory tree
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index e783582b..8db094bf 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -26,13 +26,13 @@ jobs:
       run: |
         brew update
         brew install sdl2 openal-soft make
-        brew upgrade
     - name: Check out repository code
       uses: actions/checkout@v4
     - name: Build
       run: |
         # Public runners come with 3 CPUs.
         gmake -j3
+        gmake -j3 ref_gles1
     - name: Create testbuild package
       run: |
         # Create release directory tree
diff --git a/.github/workflows/win32.yml b/.github/workflows/win32.yml
index d026cb16..c1ebdd65 100644
--- a/.github/workflows/win32.yml
+++ b/.github/workflows/win32.yml
@@ -44,6 +44,7 @@ jobs:
       run: |
         # Public runners come with 2 CPUs.
         make -j2
+        make -j2 ref_gles1
     - name: Create testbuild package
       shell: msys2 {0}
       run: |
diff --git a/README.md b/README.md
index 9bc530a4..34cb7b5c 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,7 @@ pull request to submit code:
 
 Also have a look at our contributors guide:
 
-* [Contributors Guide](https://github.com/yquake2/yquake2/blob/master/doc/080_contributing.md).
+* [Contributors Guide](https://github.com/yquake2/yquake2/blob/master/doc/080_contributing.md)
 
 
 ## Documentation