pc: 0.4 -> 0.6 (#393811)

pkgs/by-name/pc/pc/package.nix

@@ -8,18 +8,24 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "pc";
-  version = "0.4";
+  version = "0.6";
 
   src = fetchFromSourcehut {
     owner = "~ft";
     repo = "pc";
     rev = finalAttrs.version;
-    hash = "sha256-fzEDI20o5ROY9n/QRzCW66iCKYaBbI++Taur6EoA0wA=";
+    hash = "sha256-hmFzFaBMb/hqKqc+2hYda1+iowWhs/pC+6LPPhhqzJo=";
   };
 
   nativeBuildInputs = [ byacc ];
   makeFlags = [ "PREFIX=$(out)" ];
 
+  env.NIX_CFLAGS_COMPILE = toString (
+    lib.optionals stdenv.hostPlatform.isDarwin [
+      "-Wno-error=implicit-function-declaration"
+    ]
+  );
+
   strictDeps = true;
 
   enableParallelBuilding = true;