alvr.nix

            ffmpeg-alvr = super.ffmpeg-full.overrideAttrs (old: {
              configureFlags = old.configureFlags ++ [
                "--enable-vulkan"
              ];
              buildInputs = old.buildInputs ++ [
                super.vulkan-headers
                super.vulkan-loader
              ];
            });

            alvr = super.rustPlatform.buildRustPackage {
              pname = "alvr-linux";
              version = "unstable";

              src = super.fetchFromGitHub {
                owner = "alvr-org";
                repo = "alvr";
                rev = "master";
                sha256 = "sha256-GZPdO9pXV+JF41w0TJtFRn8XTKfgZI0lUxUZcH40cVM=";
              };

              cargoSha256 = "sha256-GbC+tDujj3/vyTSEN76z3lKKB680TJLrCt5I4cBHZgk=";

              nativeBuildInputs = with super; [
                binutils
                clang
                cmake
              ];

              buildInputs = with super; [
                openssl alsaLib glib ffmpeg-alvr
                cairo pango atk gdk-pixbuf
                gtk3 vulkan-headers vulkan-tools-lunarg
                vulkan-headers
                vulkan-loader
                vulkan-validation-layers
                libunwind
              ];   

              buildPhase = ''
                cargo xtask build-server --release
                cd alvr/server/cpp/tools/vulkan-layer
                mkdir build && cd build
                cmake ..
                make -j
              '';
            };