Support building on mac

feedback/package.yaml

@@ -39,6 +39,7 @@ executables:
     ghc-options:
     - -threaded
     - -rtsopts
+    - -optP-Wno-nonportable-include-path # For macos
     # -N3: Use three threads, because we only need three threads:
     # 1. FS Notify listener
     # 2. 'processWorker'

nix/overlay.nix

@@ -38,6 +38,7 @@ in
               "--ghc-options=-Wredundant-constraints"
               "--ghc-options=-Wcpp-undef"
               "--ghc-options=-Werror"
+              "--ghc-options=-optP-Wno-nonportable-include-path" # For macos
             ];
             # Ugly hack because we can't just add flags to the 'test' invocation.
             # Show test output as we go, instead of all at once afterwards.