try more fiddling with macOS

.github/workflows/build-majestic.yml

@@ -190,7 +190,8 @@ jobs:
     - name: Build & run testsuite
       working-directory: ./src/runtime/haskell
       run: |
-        cabal test --extra-lib-dirs=/usr/local/lib
+        cabal v1-install --extra-lib-dirs=/opt/homebrew/lib --extra-include-dirs=/opt/homebrew/include
+        cabal test --extra-lib-dirs=/opt/homebrew/lib
 
   macos-python:
     name: Python (macOS)
@@ -208,8 +209,8 @@ jobs:
       with:
         name: libpgf-macos
     - run: |
-        sudo mv lib/* /usr/local/lib/
-        sudo mv include/* /usr/local/include/
+        sudo mv lib/* /opt/homebrew/lib/
+        sudo mv include/* /opt/homebrew/include/
 
     - name: Install cibuildwheel
       run: |