diff --git a/.github/checkdiff.sh b/.github/checkdiff.sh
new file mode 100755
index 00000000..430aba4d
--- /dev/null
+++ b/.github/checkdiff.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+
+if ! git diff-index --quiet HEAD --; then
+    echo 'Uncommitted changes detected:'
+    git diff-index HEAD --
+    return 1
+fi
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d2c152ad..07a320b4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,25 +5,29 @@ on:
     branches: [ master ]
   pull_request:
 
+env:
+  rgbds_version: v1.0.1
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v6
 
       - name: Checkout rgbds
-        uses: actions/checkout@master
+        uses: actions/checkout@v6
         with:
           path: rgbds
-          ref: v1.0.1
+          ref: ${{ env.rgbds_version }}
           repository: gbdev/rgbds
 
       - name: Install rgbds
         working-directory: rgbds
         run: |
-          sudo apt-get install -yq libpng-dev
-          sudo make install
+          sudo apt-get update
+          sudo apt-get install -yq bison libpng-dev pkg-config
+          sudo make -j$(nproc) install
 
       - name: Remove rgbds
         run: |
@@ -33,39 +37,66 @@ jobs:
         if: ${{ github.repository_owner == 'pret' }}
         run: |
           make DEBUG=1 -j$(nproc) compare
-          if ! git diff-index --quiet HEAD --; then
-            echo 'Uncommitted changes detected:'
-            git diff-index HEAD --
-            return 1
-          fi
+          .github/checkdiff.sh
 
       - name: Make
         if: ${{ github.repository_owner != 'pret' }}
         run: |
           make -j$(nproc)
-          if ! git diff-index --quiet HEAD --; then
-            echo 'Uncommitted changes detected:'
-            git diff-index HEAD --
-            return 1
-          fi
+          .github/checkdiff.sh
 
       - name: Checkout symbols
-        if: ${{ github.event_name == 'push' && github.repository_owner == 'pret' }}
-        uses: actions/checkout@master
+        if: ${{ github.repository_owner == 'pret' && github.event_name == 'push' }}
+        uses: actions/checkout@v6
         with:
           path: symbols
           ref: symbols
 
       - name: Move symbols
-        if: ${{ github.event_name == 'push' && github.repository_owner == 'pret' }}
+        if: ${{ github.repository_owner == 'pret' && github.event_name == 'push' }}
         run: |
-          cp -v *.sym symbols/
-          cp -v *.map symbols/
+          cp -v *.sym *.map symbols/
 
       - name: Update symbols
-        if: ${{ github.event_name == 'push' && github.repository_owner == 'pret' }}
+        if: ${{ github.repository_owner == 'pret' && github.event_name == 'push' }}
         uses: EndBug/add-and-commit@v9
         with:
           cwd: "./symbols"
           add: "*.sym *.map"
           message: ${{ github.event.commits[0].message }}
+
+  build-macos:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Checkout rgbds
+        uses: actions/checkout@v6
+        with:
+          path: rgbds
+          ref: ${{ env.rgbds_version }}
+          repository: gbdev/rgbds
+
+      - name: Install rgbds
+        working-directory: rgbds
+        run: |
+          brew install bison libpng pkg-config
+          export PATH="$(brew --prefix bison)/bin:$PATH"
+          sudo make -j$(sysctl -n hw.ncpu) install
+
+      - name: Remove rgbds
+        run: |
+          rm -rf rgbds
+
+      - name: Compare
+        if: ${{ github.repository_owner == 'pret' }}
+        run: |
+          make DEBUG=1 -j$(sysctl -n hw.ncpu) compare
+          .github/checkdiff.sh
+
+      - name: Make
+        if: ${{ github.repository_owner != 'pret' }}
+        run: |
+          make -j$(sysctl -n hw.ncpu)
+          .github/checkdiff.sh