riko4: drop

The package in nixpkgs was basically unmaintained since 2018.
It's maintainer in nixpkgs is inactive since 2022.
It dependended on the already dropped SDL_gpu package, which it pinned internally.
This now also started failing to build.
While upstream has a newer version of `riko4` available,
it does not remove the SDL_gpu dependency or fix its issues.

pkgs/by-name/ri/riko4/package.nix

@@ -1,85 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchFromGitHub,
-  cmake,
-  SDL2,
-  libGLU,
-  luajit,
-  curl,
-  curlpp,
-}:
-
-let
-  # Newer versions of sdl-gpu don't work with Riko4 (corrupted graphics),
-  # and this library does not have a proper release version, so let the
-  # derivation for this stay next to the Riko4 derivation for now.
-  sdl-gpu = stdenv.mkDerivation {
-    pname = "sdl-gpu";
-    version = "2018-11-01";
-    src = fetchFromGitHub {
-      owner = "grimfang4";
-      repo = "sdl-gpu";
-      rev = "a4ff1ab02410f154b004c29ec46e07b22890fa1f";
-      sha256 = "1wdwg331s7r4dhq1l8w4dvlqf4iywskpdrscgbwrz9j0c6nqqi3v";
-    };
-    buildInputs = [
-      SDL2
-      libGLU
-    ];
-    nativeBuildInputs = [ cmake ];
-
-    meta = with lib; {
-      homepage = "https://github.com/grimfang4/sdl-gpu";
-      description = "Library for high-performance, modern 2D graphics with SDL written in C";
-      license = licenses.mit;
-      maintainers = with maintainers; [ CrazedProgrammer ];
-    };
-  };
-in
-
-stdenv.mkDerivation rec {
-  pname = "riko4";
-  version = "0.1.0";
-  src = fetchFromGitHub {
-    owner = "incinirate";
-    repo = "Riko4";
-    rev = "v${version}";
-    sha256 = "008i9991sn616dji96jfwq6gszrspbx4x7cynxb1cjw66phyy5zp";
-  };
-
-  buildInputs = [
-    SDL2
-    luajit
-    sdl-gpu
-    curl
-    curlpp
-  ];
-  nativeBuildInputs = [ cmake ];
-
-  hardeningDisable = [ "fortify" ];
-  cmakeFlags = [ "-DSDL2_gpu_INCLUDE_DIR=\"${sdl-gpu}/include\"" ];
-
-  # Riko4 needs the data/ and scripts/ directories to be in its PWD.
-  installPhase = ''
-    install -Dm0755 riko4 $out/bin/.riko4-unwrapped
-    mkdir -p $out/lib/riko4
-    cp -r ../data $out/lib/riko4
-    cp -r ../scripts $out/lib/riko4
-    cat > $out/bin/riko4 <<EOF
-    #!/bin/sh
-    pushd $out/lib/riko4 > /dev/null
-    exec $out/bin/.riko4-unwrapped "\$@"
-    popd > /dev/null
-    EOF
-    chmod +x $out/bin/riko4
-  '';
-
-  meta = with lib; {
-    homepage = "https://github.com/incinirate/Riko4";
-    description = "Fantasy console for pixel art game development";
-    mainProgram = "riko4";
-    license = licenses.mit;
-    maintainers = with maintainers; [ CrazedProgrammer ];
-  };
-}

pkgs/top-level/aliases.nix

@@ -1639,6 +1639,7 @@ mapAliases {
   rftg = throw "'rftg' has been removed due to lack of maintenance upstream."; # Added 2024-12-04
   rigsofrods = rigsofrods-bin; # Added 2023-03-22
   ring-daemon = throw "'ring-daemon' has been renamed to/replaced by 'jami-daemon'"; # Converted to throw 2024-10-17
+  riko4 = throw "'riko4' has been removed as it was unmaintained, failed to build and dependend on outdated libraries"; # Added 2025-05-18
   rippled = throw "rippled has been removed as it was broken and had not been updated since 2022"; # Added 2024-11-25
   rippled-validator-keys-tool = throw "rippled-validator-keys-tool has been removed as it was broken and had not been updated since 2022"; # Added 2024-11-25
   rke2_testing = throw "'rke2_testing' has been removed from nixpkgs as the RKE2 testing channel no longer serves releases"; # Added 2025-06-02