diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 8a19b8854..562912a3a 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -34,6 +34,7 @@ jobs:
         sed -i 's|WITH_AVCODEC:=yes|WITH_AVCODEC:=no|g' Makefile
         # 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 97d8f7922..938cfa873 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 ffmpeg molten-vk
-        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 310deec95..2126e82a4 100644
--- a/.github/workflows/win32.yml
+++ b/.github/workflows/win32.yml
@@ -48,6 +48,7 @@ jobs:
         sed -i 's|WITH_AVCODEC:=yes|WITH_AVCODEC:=no|g' Makefile
         # Public runners come with 2 CPUs.
         make -j2
+        make -j2 ref_gles1
     - name: Create testbuild package
       shell: msys2 {0}
       run: |
diff --git a/.github/workflows/win64.yml b/.github/workflows/win64.yml
index 9495394e2..12a2264e2 100644
--- a/.github/workflows/win64.yml
+++ b/.github/workflows/win64.yml
@@ -47,6 +47,7 @@ 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 8baf8d377..6db5f692e 100644
--- a/README.md
+++ b/README.md
@@ -206,7 +206,7 @@ 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