Merge pull request #173055 from trofi/workaround-fno-common-for-grafx2

grafx2: add -fcommon workaround

pkgs/applications/graphics/grafx2/default.nix

@@ -15,6 +15,12 @@ stdenv.mkDerivation rec {
 
   preBuild = "cd src";
 
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: ../obj/unix/tiles.o:/build/grafx2/src/global.h:306: multiple definition of
+  #     `Main_selector'; ../obj/unix/main.o:/build/grafx2/src/global.h:306: first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   preInstall = '' mkdir -p "$out" '';
 
   installPhase = ''make install prefix="$out"'';