retroarch: add NP2kai core

pkgs/misc/emulators/retroarch/cores.nix

@@ -718,6 +718,25 @@ in with stdenv.lib.licenses;
     preBuild = "cd libretro";
   };
 
+  np2kai = mkLibRetroCore rec {
+    core = "np2kai";
+    src = fetchFromGitHub rec {
+      owner = "AZO234";
+      repo = "NP2kai";
+      rev = "4a317747724669343e4c33ebdd34783fb7043221";
+      sha256 = "0kxysxhx6jyk82mx30ni0ydzmwdcbnlxlnarrlq018rsnwb4md72";
+    };
+    description = "Neko Project II kai libretro port";
+    license = mit;
+    makefile = "Makefile.libretro";
+    preBuild = ''
+      cd sdl2
+      substituteInPlace ${makefile} \
+        --replace 'GIT_VERSION :=' 'GIT_VERSION ?='
+      export GIT_VERSION=${builtins.substring 0 7 src.rev}
+    '';
+  };
+
   o2em = mkLibRetroCore rec {
     core = "o2em";
     src = fetchRetro {

pkgs/top-level/all-packages.nix

@@ -22760,6 +22760,7 @@ in
       ++ optional (cfg.enableMupen64Plus or false) mupen64plus
       ++ optional (cfg.enableNeoCD or false) neocd
       ++ optional (cfg.enableNestopia or false) nestopia
+      ++ optional (cfg.enableNP2kai or false) np2kai
       ++ optional (cfg.enableO2EM or false) o2em
       ++ optional (cfg.enableOpera or false) opera
       ++ optional (cfg.enableParallelN64 or false) parallel-n64