Merge pull request #305972 from viraptor/imagelol-darwin

imagelol: fix darwin build

pkgs/tools/compression/imagelol/default.nix

@@ -30,7 +30,6 @@ stdenv.mkDerivation rec {
     })
   ];
 
-
   # fix for case-sensitive filesystems
   # https://github.com/MCredstoner2004/ImageLOL/issues/1
   postPatch = ''
@@ -46,7 +45,7 @@ stdenv.mkDerivation rec {
     cp ./ImageLOL $out/bin
   '';
 
-  cmakeFlags = lib.optional (stdenv.isDarwin && stdenv.isAarch64) "-DPNG_ARM_NEON=off";
+  cmakeFlags = [ (lib.cmakeFeature "CMAKE_C_FLAGS" "-std=gnu90") ] ++ lib.optional (stdenv.isDarwin && stdenv.isAarch64) "-DPNG_ARM_NEON=off";
 
   meta = with lib; {
     homepage = "https://github.com/MCredstoner2004/ImageLOL";