diff --git a/pkgs/misc/emulators/retroarch/cores.nix b/pkgs/misc/emulators/retroarch/cores.nix
index 715f33421210..9c723fb42e63 100644
--- a/pkgs/misc/emulators/retroarch/cores.nix
+++ b/pkgs/misc/emulators/retroarch/cores.nix
@@ -1,78 +1,116 @@
-{ lib, stdenv, fetchgit, fetchFromGitHub, fetchpatch, cmake, pkg-config, makeWrapper, python27, python3, retroarch
-, alsa-lib, fluidsynth, curl, hidapi, libGLU, gettext, portaudio, SDL, SDL2, libGL
-, ffmpeg, pcre, libevdev, libpng, libjpeg, libzip, udev, libvorbis, snappy, which, hexdump
-, sfml, xorg, zlib, nasm, libpcap, boost, icu, openssl
-, buildPackages }:
+{ lib
+, stdenv
+, SDL
+, SDL2
+, alsa-lib
+, boost
+, buildPackages
+, cmake
+, curl
+, fetchFromGitHub
+, fetchgit
+, fetchpatch
+, ffmpeg
+, fluidsynth
+, gettext
+, hexdump
+, hidapi
+, icu
+, libGL
+, libGLU
+, libevdev
+, libjpeg
+, libpcap
+, libpng
+, libvorbis
+, libzip
+, makeWrapper
+, nasm
+, openssl
+, pcre
+, pkg-config
+, portaudio
+, python27
+, python3
+, retroarch
+, sfml
+, snappy
+, udev
+, which
+, xorg
+, zlib
+}:
 
 let
 
-  d2u = lib.replaceChars ["-"] ["_"];
+  d2u = lib.replaceChars [ "-" ] [ "_" ];
 
-  mkLibRetroCore = { core, src, description, license, broken ? false, version ? "2020-03-06", ... }@a:
-  lib.makeOverridable stdenv.mkDerivation ((rec {
+  mkLibRetroCore =
+    { core
+    , src
+    , description
+    , license
+    , broken ? false
+    , version ? "unstable-2021-11-16"
+    , ...
+    }@args:
+    lib.makeOverridable stdenv.mkDerivation ((rec {
 
-    name = "libretro-${a.core}-${version}";
-    inherit version;
-    inherit (a) src;
+      name = "libretro-${core}-${version}";
+      inherit src version;
 
-    buildInputs = [ zlib ] ++ a.extraBuildInputs or [];
-    nativeBuildInputs = [ makeWrapper ] ++ a.extraNativeBuildInputs or [];
+      buildInputs = [ zlib ] ++ args.extraBuildInputs or [ ];
+      nativeBuildInputs = [ makeWrapper ] ++ args.extraNativeBuildInputs or [ ];
 
-    makefile = "Makefile.libretro";
-    makeFlags = [
-      "platform=${{
+      makefile = "Makefile.libretro";
+      makeFlags = [
+        "platform=${{
         linux = "unix";
         darwin = "osx";
         windows = "win";
       }.${stdenv.hostPlatform.parsed.kernel.name} or stdenv.hostPlatform.parsed.kernel.name}"
-      "ARCH=${{
+        "ARCH=${{
         armv7l = "arm";
         armv6l = "arm";
         i686 = "x86";
       }.${stdenv.hostPlatform.parsed.cpu.name} or stdenv.hostPlatform.parsed.cpu.name}"
-    ] ++ (a.makeFlags or []);
+      ] ++ (args.makeFlags or [ ]);
 
-    installPhase = ''
-      COREDIR="$out/lib/retroarch/cores"
-      mkdir -p $out/bin
-      mkdir -p $COREDIR
-      mv ${d2u a.core}_libretro${stdenv.hostPlatform.extensions.sharedLibrary} $COREDIR
-      makeWrapper ${retroarch}/bin/retroarch $out/bin/retroarch-${core} \
-        --add-flags "-L $COREDIR/${d2u core}_libretro${stdenv.hostPlatform.extensions.sharedLibrary} $@"
-    '';
+      installPhase = ''
+        COREDIR="$out/lib/retroarch/cores"
+        mkdir -p $out/bin
+        mkdir -p $COREDIR
+        mv ${d2u args.core}_libretro${stdenv.hostPlatform.extensions.sharedLibrary} $COREDIR
+        makeWrapper ${retroarch}/bin/retroarch $out/bin/retroarch-${core} \
+          --add-flags "-L $COREDIR/${d2u core}_libretro${stdenv.hostPlatform.extensions.sharedLibrary} $@"
+      '';
 
-    passthru = {
-      inherit (a) core;
-      libretroCore = "/lib/retroarch/cores";
-    };
+      passthru = {
+        inherit core;
+        libretroCore = "/lib/retroarch/cores";
+      };
 
-    meta = with lib; {
-      inherit (a) description license;
-      broken = a.broken or false;
-      homepage = "https://www.libretro.com/";
-      maintainers = with maintainers; [ edwtjo hrdinka MP2E ];
-      platforms = platforms.unix;
-    };
-  }) // builtins.removeAttrs a ["core" "src" "description" "license" "makeFlags"]);
+      meta = with lib; {
+        inherit broken description license;
+        homepage = "https://www.libretro.com/";
+        maintainers = with maintainers; [ edwtjo hrdinka MP2E ];
+        platforms = platforms.unix;
+      };
+    }) // builtins.removeAttrs args [ "core" "src" "description" "license" "makeFlags" ]);
 
-  fetchRetro = { repo, rev, sha256 }:
-  fetchgit {
-    inherit rev sha256;
-    url = "https://github.com/libretro/${repo}.git";
-    fetchSubmodules = true;
-  };
+  hashesFile = builtins.fromJSON (builtins.readFile ./hashes.json);
 
-in with lib.licenses;
+  getCoreSrc = core:
+    fetchFromGitHub (builtins.getAttr core hashesFile);
+
+in
+with lib.licenses;
 
 {
 
   atari800 = mkLibRetroCore rec {
     core = "atari800";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "f9bf53b864344b8bbe8d425ed2f3c628eb10519c";
-      sha256 = "0sgk93zs423pwiqzvj0x1gfwcn9gacnlrrdq53ps395k64lig6lk";
-    };
+    src = getCoreSrc core;
     description = "Port of Atari800 to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -81,11 +119,7 @@ in with lib.licenses;
 
   beetle-snes = mkLibRetroCore {
     core = "mednafen-snes";
-    src = fetchRetro {
-      repo = "beetle-bsnes-libretro";
-      rev = "de22d8420ea606f1b2f72afd4dda34619cf2cc20";
-      sha256 = "1nd4f8frmlhp1lyxz9zpxvwwz70x0i0rrp560cn9qlm1jzdv3xvf";
-    };
+    src = getCoreSrc "beetle-snes";
     description = "Port of Mednafen's SNES core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -93,11 +127,7 @@ in with lib.licenses;
 
   beetle-gba = mkLibRetroCore {
     core = "mednafen-gba";
-    src = fetchRetro {
-      repo = "beetle-gba-libretro";
-      rev = "135afdbb9591655a3e016b75abba07e481f6d406";
-      sha256 = "0fc0x24qn4y7pz3mp1mm1ain31aj9pznp1irr0k7hvazyklzy9g3";
-    };
+    src = getCoreSrc "beetle-gba";
     description = "Port of Mednafen's GameBoy Advance core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -105,11 +135,7 @@ in with lib.licenses;
 
   beetle-lynx = mkLibRetroCore {
     core = "mednafen-lynx";
-    src = fetchRetro {
-      repo = "beetle-lynx-libretro";
-      rev = "74dde204c0ec6c4bc4cd7821c14548387fbd9ce8";
-      sha256 = "05kwibjr30laalqzazswvmn9smm3mwqsz1i0z1s0pj7idfdhjfw0";
-    };
+    src = getCoreSrc "beetle-lynx";
     description = "Port of Mednafen's Lynx core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -117,113 +143,87 @@ in with lib.licenses;
 
   beetle-ngp = mkLibRetroCore {
     core = "mednafen-ngp";
-    src = fetchRetro {
-      repo = "beetle-ngp-libretro";
-      rev = "6f15532b6ad17a2d5eb9dc8241d6af62416e796b";
-      sha256 = "05r8mk9rc19nzs3gpfsjr6i7pm6xx3gn3b4xs8ab7v4vcmfg4cn2";
-    };
+    src = getCoreSrc "beetle-ngp";
     description = "Port of Mednafen's NeoGeo Pocket core to libretro";
     license = gpl2;
     makefile = "Makefile";
   };
 
-  beetle-pce-fast = let der = mkLibRetroCore {
-    core = "mednafen-pce-fast";
-    src = fetchRetro {
-      repo = "beetle-pce-fast-libretro";
-      rev = "40a42b7f43f029760c92bf0b2097e7d4b90ed29c";
-      sha256 = "1gr6wg4bd4chm4c39w0c1b5zfzr05zd7234vvlmr1imk0v6m0wj6";
+  beetle-pce-fast =
+    let drv = mkLibRetroCore {
+      core = "mednafen-pce-fast";
+      src = getCoreSrc "beetle-pce-fast";
+      description = "Port of Mednafen's PC Engine core to libretro";
+      license = gpl2;
+      makefile = "Makefile";
+    }; in
+    drv.override {
+      name = "beetle-pce-fast-${drv.version}";
     };
-    description = "Port of Mednafen's PC Engine core to libretro";
-    license = gpl2;
-    makefile = "Makefile";
-  }; in der.override {
-    name = "beetle-pce-fast-${der.version}";
-  };
 
   beetle-pcfx = mkLibRetroCore rec {
     core = "mednafen-pcfx";
-    src = fetchRetro {
-      repo = "beetle-pcfx-libretro";
-      rev = "7bba6699d6f903bd701b0aa525d845de8427fee6";
-      sha256 = "1lh7dh96fyi005fcg3xaf7r4ssgkq840p6anldlqy52vfwmglw3p";
-    };
+    src = getCoreSrc "beetle-pcfx";
     description = "Port of Mednafen's PCFX core to libretro";
     license = gpl2;
     makefile = "Makefile";
   };
 
-  beetle-psx = let der = (mkLibRetroCore {
+  beetle-psx = let drv = (mkLibRetroCore {
     core = "mednafen-psx";
-    src = fetchRetro {
-      repo = "beetle-psx-libretro";
-      rev = "0f1e7e60827cad49ebba628abdc83ad97652ab89";
-      sha256 = "1j92jgddyl970v775d6gyb50l8md6yfym2fpqhfxcr4gj1b4ivwq";
-    };
+    src = getCoreSrc "beetle-psx";
     description = "Port of Mednafen's PSX Engine core to libretro";
     license = gpl2;
     makefile = "Makefile";
     makeFlags = [ "HAVE_HW=0" "HAVE_LIGHTREC=1" ];
-  }); in der.override {
-    name = "beetle-psx-${der.version}";
-  };
-
-  beetle-psx-hw = let der = (mkLibRetroCore {
-    core = "mednafen-psx-hw";
-    src = fetchRetro {
-      repo = "beetle-psx-libretro";
-      rev = "0f1e7e60827cad49ebba628abdc83ad97652ab89";
-      sha256 = "1j92jgddyl970v775d6gyb50l8md6yfym2fpqhfxcr4gj1b4ivwq";
+  }); in
+    drv.override {
+      name = "beetle-psx-${drv.version}";
     };
+
+  beetle-psx-hw = let drv = (mkLibRetroCore {
+    core = "mednafen-psx-hw";
+    src = getCoreSrc "beetle-psx";
     description = "Port of Mednafen's PSX Engine (with HW accel) core to libretro";
     license = gpl2;
     extraBuildInputs = [ libGL libGLU ];
     makefile = "Makefile";
     makeFlags = [ "HAVE_VULKAN=1" "HAVE_OPENGL=1" "HAVE_HW=1" "HAVE_LIGHTREC=1" ];
-  }); in der.override {
-    name = "beetle-psx-hw-${der.version}";
-  };
-
-  beetle-saturn = let der = (mkLibRetroCore {
-    core = "mednafen-saturn";
-    src = fetchRetro {
-      repo = "beetle-saturn-libretro";
-      rev = "8a65943bb7bbc3183eeb0d57c4ac3e663f1bcc11";
-      sha256 = "1f0cd9wmvarsmf4jw0p6h3lbzs6515aja7krrwapja7i4xmgbrnh";
+  }); in
+    drv.override {
+      name = "beetle-psx-hw-${drv.version}";
     };
+
+  beetle-saturn = let drv = (mkLibRetroCore {
+    core = "mednafen-saturn";
+    src = getCoreSrc "beetle-saturn";
     description = "Port of Mednafen's Saturn core to libretro";
     license = gpl2;
     makefile = "Makefile";
     makeFlags = [ "HAVE_HW=0" ];
     meta.platforms = [ "x86_64-linux" "aarch64-linux" ];
-  }); in der.override {
-    name = "beetle-saturn-${der.version}";
-  };
-
-  beetle-saturn-hw = let der = (mkLibRetroCore {
-    core = "mednafen-saturn-hw";
-    src = fetchRetro {
-      repo = "beetle-saturn-libretro";
-      rev = "8a65943bb7bbc3183eeb0d57c4ac3e663f1bcc11";
-      sha256 = "1f0cd9wmvarsmf4jw0p6h3lbzs6515aja7krrwapja7i4xmgbrnh";
+  }); in
+    drv.override {
+      name = "beetle-saturn-${drv.version}";
     };
+
+  beetle-saturn-hw = let drv = (mkLibRetroCore {
+    core = "mednafen-saturn-hw";
+    src = getCoreSrc "beetle-saturn";
     description = "Port of Mednafen's Saturn core to libretro";
     license = gpl2;
     extraBuildInputs = [ libGL libGLU ];
     makefile = "Makefile";
     makeFlags = [ "HAVE_OPENGL=1" "HAVE_HW=1" ];
     meta.platforms = [ "x86_64-linux" "aarch64-linux" ];
-  }); in der.override {
-    name = "beetle-saturn-${der.version}";
-  };
+  }); in
+    drv.override {
+      name = "beetle-saturn-${drv.version}";
+    };
 
   beetle-supergrafx = mkLibRetroCore rec {
     core = "mednafen-supergrafx";
-    src = fetchRetro {
-      repo = "beetle-supergrafx-libretro";
-      rev = "fadef23d59fa5ec17bc99e1e722cfd9e10535695";
-      sha256 = "15rm7p5q38qy3xpyvamhphjnna8h91fsbcqnl9vhzx9cmjg0wf54";
-    };
+    src = getCoreSrc "beetle-supergrafx";
     description = "Port of Mednafen's SuperGrafx core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -231,11 +231,7 @@ in with lib.licenses;
 
   beetle-wswan = mkLibRetroCore rec {
     core = "mednafen-wswan";
-    src = fetchRetro {
-      repo = "beetle-wswan-libretro";
-      rev = "5b03d1b09f70dc208387d3c8b59e12e1f0d2692f";
-      sha256 = "1sm6ww3y9m85lhp74dpxbs05yxdhhqqmj2022j9s0m235z29iygc";
-    };
+    src = getCoreSrc "beetle-wswan";
     description = "Port of Mednafen's WonderSwan core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -243,11 +239,7 @@ in with lib.licenses;
 
   beetle-vb = mkLibRetroCore rec {
     core = "mednafen-vb";
-    src = fetchRetro {
-      repo = "beetle-vb-libretro";
-      rev = "9a4e604a7320a3c6ed30601989fe0bc417fa9ad3";
-      sha256 = "1gallwbqxn5qbmwxr1vxb41nncksai4rxc739a7vqvp65k5kl0qp";
-    };
+    src = getCoreSrc "beetle-vb";
     description = "Port of Mednafen's VirtualBoy core to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -255,37 +247,24 @@ in with lib.licenses;
 
   bluemsx = mkLibRetroCore rec {
     core = "bluemsx";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "7a1d40e750860580ab7cc21fbc244b5bc6db6586";
-      sha256 = "05hnkyr47djccspr8v438zimdfsgym7v0jn1hwpkqc4i5zf70981";
-    };
+    src = getCoreSrc core;
     description = "Port of BlueMSX to libretro";
     license = gpl2;
   };
 
-  bsnes-mercury = let bname = "bsnes-mercury"; in mkLibRetroCore {
-    core = bname + "-accuracy";
-    src = fetchRetro {
-      repo = bname;
-      rev = "4a382621da58ae6da850f1bb003ace8b5f67968c";
-      sha256 = "0z8psz24nx8497vpk2wya9vs451rzzw915lkw3qiq9bzlzg9r2wv";
+  bsnes-mercury = let bname = "bsnes-mercury"; in
+    mkLibRetroCore {
+      core = bname + "-accuracy";
+      src = getCoreSrc "bsnes-mercury";
+      description = "Fork of bsnes with HLE DSP emulation restored";
+      license = gpl3;
+      makefile = "Makefile";
+      makeFlags = [ "PROFILE=accuracy" ];
     };
-    description = "Fork of bsnes with HLE DSP emulation restored";
-    license = gpl3;
-    makefile = "Makefile";
-    postBuild = "cd out";
-  };
 
   citra = mkLibRetroCore rec {
     core = "citra";
-    src = fetchgit {
-      url = "https://github.com/libretro/citra.git";
-      rev = "84f31e95160b029e6d614053705054ed6a34bb38";
-      sha256 = "0gkgxpwrh0q098cpx56hprvmazi5qi448c23svwa8ar1myh8p248";
-      fetchSubmodules = true;
-      deepClone = true;
-    };
+    src = getCoreSrc core;
     description = "Port of Citra to libretro";
     license = gpl2Plus;
     extraNativeBuildInputs = [ cmake pkg-config ];
@@ -304,50 +283,42 @@ in with lib.licenses;
 
   desmume = mkLibRetroCore rec {
     core = "desmume";
-    src = fetchRetro {
-      repo = core;
-      rev = "e8cf461f83eebb195f09e70090f57b07d1bcdd9f";
-      sha256 = "0rc8s5226wn39jqs5yxi30jc1snc0p106sfym7kgi98hy5na8yab";
-    };
+    src = getCoreSrc core;
     description = "libretro wrapper for desmume NDS emulator";
     license = gpl2;
     extraBuildInputs = [ libpcap libGLU libGL xorg.libX11 ];
     preBuild = "cd desmume/src/frontend/libretro";
     makeFlags = lib.optional stdenv.hostPlatform.isAarch32 "platform=armv-unix"
-             ++ lib.optional (!stdenv.hostPlatform.isx86) "DESMUME_JIT=0";
+      ++ lib.optional (!stdenv.hostPlatform.isx86) "DESMUME_JIT=0";
   };
 
   desmume2015 = mkLibRetroCore rec {
     core = "desmume2015";
-    src = fetchRetro {
-      repo = core;
-      rev = "93d5789d60f82436e20ccad05ce9cb43c6e3656e";
-      sha256 = "12nii2pbnqgh7f7jkphbwjpr2hiy2mzbwpas3xyhpf9wpy3qiasg";
-    };
+    src = getCoreSrc core;
     description = "libretro wrapper for desmume NDS emulator from 2015";
     license = gpl2;
     extraBuildInputs = [ libpcap libGLU libGL xorg.libX11 ];
     makeFlags = lib.optional stdenv.hostPlatform.isAarch32 "platform=armv-unix"
-             ++ lib.optional (!stdenv.hostPlatform.isx86) "DESMUME_JIT=0";
+      ++ lib.optional (!stdenv.hostPlatform.isx86) "DESMUME_JIT=0";
     preBuild = "cd desmume";
   };
 
-  dolphin = mkLibRetroCore {
+  dolphin = mkLibRetroCore rec {
     core = "dolphin";
-    version = "2021-11-01";
-    src = fetchRetro {
-      repo = "dolphin";
-      rev = "3370f7693be95c23ac779e5172ff52b7eb2861a7";
-      sha256 = "0ylxi25kbv0h2p24aid7z4i0w6drf7h92q02hjdl3h3gni98lk9i";
-    };
+    src = getCoreSrc core;
     description = "Port of Dolphin to libretro";
     license = gpl2Plus;
 
     extraNativeBuildInputs = [ cmake curl pkg-config ];
     extraBuildInputs = [
-      libGLU libGL pcre sfml
-      gettext hidapi
-      libevdev udev
+      libGLU
+      libGL
+      pcre
+      sfml
+      gettext
+      hidapi
+      libevdev
+      udev
     ] ++ (with xorg; [ libSM libX11 libXi libpthreadstubs libxcb xcbutil libXext libXrandr libXinerama libXxf86vm ]);
     makefile = "Makefile";
     cmakeFlags = [
@@ -364,33 +335,21 @@ in with lib.licenses;
 
   dosbox = mkLibRetroCore rec {
     core = "dosbox";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "e4ed503b14ed59d5d745396ef1cc7d52cf912328";
-      sha256 = "13bx0ln9hwn6hy4sv0ivqmjgjbfq8svx15dsa24hwd8lkf0kakl4";
-    };
+    src = getCoreSrc core;
     description = "Port of DOSBox to libretro";
     license = gpl2;
   };
 
   eightyone = mkLibRetroCore rec {
     core = "81";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "4352130bd2363954262a804b086f86b9d13d97f9";
-      sha256 = "057ynnv85imjqhgixrx7p28wn42v88vsm3fc1lp3mpcfi2bk266h";
-    };
+    src = getCoreSrc "eightyone";
     description = "Port of EightyOne to libretro";
     license = gpl3;
   };
 
   fbalpha2012 = mkLibRetroCore rec {
     core = "fbalpha2012";
-    src = fetchRetro {
-      repo = core;
-      rev = "fa97cd2784a337f8ac774c2ce8a136aee69b5f43";
-      sha256 = "1i75k0r6838hl77bjjmzvan33ka5qjrdpirmclzj20g5j97lmas7";
-    };
+    src = getCoreSrc core;
     description = "Port of Final Burn Alpha ~2012 to libretro";
     license = "Non-commercial";
     makefile = "makefile.libretro";
@@ -399,11 +358,7 @@ in with lib.licenses;
 
   fbneo = mkLibRetroCore rec {
     core = "fbneo";
-    src = fetchRetro {
-      repo = core;
-      rev = "cf43fdb1755f9f5c886266e86ba40d339bc8f5d7";
-      sha256 = "13g3c6mbwhcf0rp95ga4klszh8dab2d4ahh2vzzlmd57r69lf2lv";
-    };
+    src = getCoreSrc core;
     description = "Port of FBNeo to libretro";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -416,22 +371,14 @@ in with lib.licenses;
 
   fceumm = mkLibRetroCore rec {
     core = "fceumm";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "9ed22e5a9a1360a7f599a64283af9fe24b858e3d";
-      sha256 = "0rz6iy281jpybmsz5rh06k5xvmd9id9w2q2gd0qdv9a2ylwv7s2j";
-    };
+    src = getCoreSrc core;
     description = "FCEUmm libretro port";
     license = gpl2;
   };
 
   flycast = mkLibRetroCore rec {
     core = "flycast";
-    src = fetchRetro {
-      repo = core;
-      rev = "b12f3726d9093acb4e441b1cdcf6cd11403c8644";
-      sha256 = "0nczjhdqr7svq9aflczf7rwz64bih1wqy9q0gyglb55xlslf5jqc";
-    };
+    src = getCoreSrc core;
     description = "Flycast libretro port";
     license = gpl2;
     extraBuildInputs = [ libGL libGLU ];
@@ -442,11 +389,7 @@ in with lib.licenses;
 
   fmsx = mkLibRetroCore rec {
     core = "fmsx";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "3de916bbf15062de1ab322432d38a1fee29d5e68";
-      sha256 = "1krr4lmdiv0d7bxk37fqz5y412znb5bmxapv9g7ci6fp87sr69jq";
-    };
+    src = getCoreSrc core;
     description = "FMSX libretro port";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -454,11 +397,7 @@ in with lib.licenses;
 
   freeintv = mkLibRetroCore rec {
     core = "freeintv";
-    src = fetchRetro {
-      repo = core;
-      rev = "45030e10cc1a50cf7a80c5d921aa8cba0aeaca91";
-      sha256 = "10lngk3p012bgrg752426701hfzsiy359h8i0vzsa64pgyjbqlag";
-    };
+    src = getCoreSrc core;
     description = "FreeIntv libretro port";
     license = gpl3;
     makefile = "Makefile";
@@ -466,33 +405,21 @@ in with lib.licenses;
 
   gambatte = mkLibRetroCore rec {
     core = "gambatte";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "132f36e990dfc6effdafa6cf261373432464f9bf";
-      sha256 = "19w5k9yc1cl99c5hiqbp6j54g6z06xcblpvd3x6nmhxij81yqxy7";
-    };
+    src = getCoreSrc core;
     description = "Gambatte libretro port";
     license = gpl2;
   };
 
-  genesis-plus-gx = mkLibRetroCore {
+  genesis-plus-gx = mkLibRetroCore rec {
     core = "genesis-plus-gx";
-    src = fetchRetro {
-      repo = "Genesis-Plus-GX";
-      rev = "50551066f71f8a5ea782ea3747891fd6d24ebe67";
-      sha256 = "150lgdrv7idcq7jbd1jj7902rcsyixd7kfjs2m5xdinjvl22kihr";
-    };
+    src = getCoreSrc core;
     description = "Enhanced Genesis Plus libretro port";
     license = "Non-commercial";
   };
 
   gpsp = mkLibRetroCore rec {
     core = "gpsp";
-    src = fetchRetro {
-      repo = core;
-      rev = "3f2f57c982ffead643957db5b26931df4913596f";
-      sha256 = "09fa1c623rmy1w9zx85r75viv8q1vknhbs8fn6xbss9rhpxhivwg";
-    };
+    src = getCoreSrc core;
     description = "Port of gpSP to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -500,11 +427,7 @@ in with lib.licenses;
 
   gw = mkLibRetroCore rec {
     core = "gw";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "819b1dde560013003eeac86c2069c5be7af25c6d";
-      sha256 = "1jhgfys8hiipvbwq3gc48d7v6wq645d10rbr4w5m6px0fk6csshk";
-    };
+    src = getCoreSrc core;
     description = "Port of Game and Watch to libretro";
     license = lib.licenses.zlib;
     makefile = "Makefile";
@@ -512,11 +435,7 @@ in with lib.licenses;
 
   handy = mkLibRetroCore rec {
     core = "handy";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "c9fe65d1a2df454ee11404ac27bdc9be319dd9a2";
-      sha256 = "1l1gi8z68mv2cpdy7a6wvhd86q55khj3mv3drf43ak4kj2ij8cvq";
-    };
+    src = getCoreSrc core;
     description = "Port of Handy to libretro";
     license = "Handy-License";
     makefile = "Makefile";
@@ -524,11 +443,7 @@ in with lib.licenses;
 
   hatari = mkLibRetroCore rec {
     core = "hatari";
-    src = fetchRetro {
-      repo = core;
-      rev = "ec1b59c4b6c7ca7d0d23d60cfe2cb61911b11173";
-      sha256 = "1pm821s2cz93xr7qx7dv0imr44bi4pvdvlnjl486p83vff9yawfg";
-    };
+    src = getCoreSrc core;
     description = "Port of Hatari to libretro";
     license = gpl2;
     extraBuildInputs = [ SDL zlib ];
@@ -539,17 +454,13 @@ in with lib.licenses;
     depsBuildBuild = [ buildPackages.stdenv.cc ];
   };
 
-  mame = mkLibRetroCore {
+  mame = mkLibRetroCore rec {
     core = "mame";
-    src = fetchRetro {
-      repo = "mame";
-      rev = "ed987ad07964a938351ff3cc1ad42e02ffd2af6d";
-      sha256 = "0qc66mvraffx6ws972skx3wgblich17q6z42798qn13q1a264p4j";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME to libretro";
     license = gpl2Plus;
 
-    extraBuildInputs = [ alsa-lib libGLU libGL portaudio python27 xorg.libX11 ];
+    extraBuildInputs = [ alsa-lib libGLU libGL portaudio python3 xorg.libX11 ];
     postPatch = ''
       # Prevent the failure during the parallel building of:
       # make -C 3rdparty/genie/build/gmake.linux -f genie.make obj/Release/src/host/lua-5.3.0/src/lgc.o
@@ -560,11 +471,7 @@ in with lib.licenses;
 
   mame2000 = mkLibRetroCore rec {
     core = "mame2000";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "e5d4a934c60adc6d42a3f87319312aad89595a15";
-      sha256 = "1zn63yqyrsnsk196v5f3nm7cx41mvsm3icpis1yxbma2r3dk3f89";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME ~2000 to libretro";
     license = gpl2Plus;
     makefile = "Makefile";
@@ -573,11 +480,7 @@ in with lib.licenses;
 
   mame2003 = mkLibRetroCore rec {
     core = "mame2003";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "82596014905ad38c80c9eb322ab08c625d1d92cd";
-      sha256 = "17dp2rz6p7q7nr0lajn3vhk9ghngxz16f7c6c87r6wgsy4y3xw0m";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME ~2003 to libretro";
     license = gpl2Plus;
     makefile = "Makefile";
@@ -585,11 +488,7 @@ in with lib.licenses;
 
   mame2003-plus = mkLibRetroCore rec {
     core = "mame2003-plus";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "0134c428b75882aa474f78dbbf2c6ecde49b97b7";
-      sha256 = "0jln2ys6v9hrsrkhqd87jfslwvkca425f40mf7866g6b4pz56mwc";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME ~2003+ to libretro";
     license = gpl2Plus;
     makefile = "Makefile";
@@ -597,11 +496,7 @@ in with lib.licenses;
 
   mame2010 = mkLibRetroCore rec {
     core = "mame2010";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "d3151837758eade73c85c28c20e7d2a8706f30c6";
-      sha256 = "0hj0yhc8zs32fkzn8j341ybhvrsknv0k6x0z2fv3l9ic7swgb93i";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME ~2010 to libretro";
     license = gpl2Plus;
     makefile = "Makefile";
@@ -610,11 +505,7 @@ in with lib.licenses;
 
   mame2015 = mkLibRetroCore rec {
     core = "mame2015";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "37333ed6fda4c798a1d6b055fe4708f9f0dcf5a7";
-      sha256 = "1asldlj1ywgmhabbhaagagg5hn0359122al07802q3l57ns41l64";
-    };
+    src = getCoreSrc core;
     description = "Port of MAME ~2015 to libretro";
     license = gpl2Plus;
     extraNativeBuildInputs = [ python27 ];
@@ -624,11 +515,7 @@ in with lib.licenses;
 
   mame2016 = mkLibRetroCore rec {
     core = "mame2016";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "02987af9b81a9c3294af8fb9d5a34f9826a2cf4d";
-      sha256 = "0gl7irmn5d8lk7kf484vgw6kb325fq4ghwsni3il4nm5n2a8yglh";
-    };
+    src = getCoreSrc core;
     patches = [
       (fetchpatch {
         name = "fix_mame_build_on_make-4.3.patch";
@@ -649,12 +536,7 @@ in with lib.licenses;
 
   mesen = mkLibRetroCore rec {
     core = "mesen";
-    src = fetchFromGitHub {
-      owner = "SourMesen";
-      repo = core;
-      rev = "cfc5bf6976f62ebd42ea30d5a803c138fc357509";
-      sha256 = "0ihlgvzvni1yqcyi5yxdvg36q20fsqd6n67zavwfb2ph09cqv7kz";
-    };
+    src = getCoreSrc core;
     description = "Port of Mesen to libretro";
     license = gpl3;
     makefile = "Makefile";
@@ -663,11 +545,7 @@ in with lib.licenses;
 
   meteor = mkLibRetroCore rec {
     core = "meteor";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "3d21e3b5a7596918bee0fcaca5752ae76624c05e";
-      sha256 = "0fghnxxbdrkdz6zswkd06w2r3dvr4ikvcp8jbr7nb9fc5yzn0avw";
-    };
+    src = getCoreSrc core;
     description = "Port of Meteor to libretro";
     license = gpl3;
     makefile = "Makefile";
@@ -676,22 +554,14 @@ in with lib.licenses;
 
   mgba = mkLibRetroCore rec {
     core = "mgba";
-    src = fetchRetro {
-      repo = core;
-      rev = "f87f9ef6cb38537e07dcaedeb82aecac6537d42e";
-      sha256 = "0yixvnzgk7qvcfz12r5y8i85czqxbxx6bvl1c7yms8riqn9ssvb7";
-    };
+    src = getCoreSrc core;
     description = "Port of mGBA to libretro";
     license = mpl20;
   };
 
   mupen64plus = mkLibRetroCore {
     core = "mupen64plus-next";
-    src = fetchRetro {
-      repo = "mupen64plus-libretro-nx";
-      rev = "81a58df0263c90b10b7fc11b6deee04d47e3aa40";
-      sha256 = "1brqyrsdzdq53a68q7ph01q2bx5y4m8b3ymvpp25229imm88lgkn";
-    };
+    src = getCoreSrc "mupen64plus";
     description = "Libretro port of Mupen64 Plus, GL only";
     license = gpl2;
 
@@ -701,11 +571,7 @@ in with lib.licenses;
 
   neocd = mkLibRetroCore rec {
     core = "neocd";
-    src = fetchRetro {
-      repo = core + "_libretro";
-      rev = "3825848fe7dd7e0ef859729eefcb29e2ea2956b7";
-      sha256 = "018vfmjsx62zk45yx3pwisp4j133yxjbm7fnwwr244gnyms57711";
-    };
+    src = getCoreSrc core;
     description = "NeoCD libretro port";
     license = gpl3;
     makefile = "Makefile";
@@ -713,11 +579,7 @@ in with lib.licenses;
 
   nestopia = mkLibRetroCore rec {
     core = "nestopia";
-    src = fetchRetro {
-      repo = core;
-      rev = "70c53f08c0cc92e90d095d6558ab737ce20431ac";
-      sha256 = "1hlfqml66wy6fn40f1iiy892vq9y9fj20vv3ynd2s3b3qxhwfx73";
-    };
+    src = getCoreSrc core;
     description = "Nestopia libretro port";
     license = gpl2;
     makefile = "Makefile";
@@ -726,30 +588,21 @@ in with lib.licenses;
 
   np2kai = mkLibRetroCore rec {
     core = "np2kai";
-    src = fetchFromGitHub rec {
-      owner = "AZO234";
-      repo = "NP2kai";
-      rev = "4a317747724669343e4c33ebdd34783fb7043221";
-      sha256 = "0kxysxhx6jyk82mx30ni0ydzmwdcbnlxlnarrlq018rsnwb4md72";
-    };
+    src = getCoreSrc core;
     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}
-    '';
+    makeFlags = [
+      # See https://github.com/AZO234/NP2kai/tags
+      "NP2KAI_VERSION=rev.22"
+      "NP2KAI_HASH=${src.rev}"
+    ];
+    preBuild = "cd sdl";
   };
 
   o2em = mkLibRetroCore rec {
     core = "o2em";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "b23a796dd3490e979ff43710317df6d43bd661e1";
-      sha256 = "1pkbq7nig394zdjdic0mzdsvx8xhzamsh53xh2hzznipyj46b7z0";
-    };
+    src = getCoreSrc core;
     description = "Port of O2EM to libretro";
     license = artistic1;
     makefile = "Makefile";
@@ -757,11 +610,7 @@ in with lib.licenses;
 
   opera = mkLibRetroCore rec {
     core = "opera";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "27bc2653ed469072a6a95102a8212a35fbb1e590";
-      sha256 = "10cxjpsd35rb4fjc5ycs1h00gvshpn2mxxvwb6xzrfrzva0kjw1l";
-    };
+    src = getCoreSrc core;
     description = "Opera is a port of 4DO/libfreedo to libretro";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -770,11 +619,7 @@ in with lib.licenses;
 
   parallel-n64 = mkLibRetroCore rec {
     core = "parallel-n64";
-    src = fetchRetro {
-      repo = core;
-      rev = "8fe07c62a364d0af1e22b7f75e839d42872dae7f";
-      sha256 = "0p3fpldw6w4n4l60bv55c17vhqwq4q39fp36h8iqmnj7c32c61kf";
-    };
+    src = getCoreSrc core;
     description = "Parallel Mupen64plus rewrite for libretro.";
     license = gpl2;
     extraBuildInputs = [ libGLU libGL libpng ];
@@ -787,11 +632,7 @@ in with lib.licenses;
 
   pcsx_rearmed = mkLibRetroCore rec {
     core = "pcsx_rearmed";
-    src = fetchRetro {
-      repo = core;
-      rev = "8fda5dd0e28fe46621fb1ab57781c316143017da";
-      sha256 = "0k371d0xqzqwy8ishvxssgasm36q83qj7ksn2av110n879n4knwb";
-    };
+    src = getCoreSrc core;
     description = "Port of PCSX ReARMed with GNU lightning to libretro";
     license = gpl2;
     dontConfigure = true;
@@ -799,28 +640,20 @@ in with lib.licenses;
 
   picodrive = mkLibRetroCore rec {
     core = "picodrive";
-    src = fetchRetro {
-      repo = core;
-      rev = "600894ec6eb657586a972a9ecd268f50907a279c";
-      sha256 = "1bxphwnq4b80ssmairy8sfc5cp4m6jyvrcjcj63q1vk7cs6qls7p";
-    };
+    src = getCoreSrc core;
     description = "Fast MegaDrive/MegaCD/32X emulator";
     license = "MAME";
 
     extraBuildInputs = [ libpng SDL ];
     SDL_CONFIG = "${SDL.dev}/bin/sdl-config";
     dontAddPrefix = true;
-    configurePlatforms = [];
+    configurePlatforms = [ ];
     makeFlags = lib.optional stdenv.hostPlatform.isAarch64 [ "platform=aarch64" ];
   };
 
-  play = mkLibRetroCore {
+  play = mkLibRetroCore rec {
     core = "play";
-    src = fetchRetro {
-      repo = "play-";
-      rev = "884ae3b96c631f235cd18b2643d1f318fa6951fb";
-      sha256 = "0m9pk20jh4y02visgzfw64bpbw93bzs15x3a3bnd19yivm34dbfc";
-    };
+    src = getCoreSrc core;
     description = "Port of Play! to libretro";
     license = bsd2;
     extraBuildInputs = [ boost ];
@@ -828,24 +661,12 @@ in with lib.licenses;
     makefile = "Makefile";
     cmakeFlags = [ "-DBUILD_PLAY=OFF -DBUILD_LIBRETRO_CORE=ON" ];
     postBuild = "mv Source/ui_libretro/play_libretro${stdenv.hostPlatform.extensions.sharedLibrary} play_libretro${stdenv.hostPlatform.extensions.sharedLibrary}";
+    broken = true; # since 2021-01-03
   };
 
-  ppsspp = mkLibRetroCore {
+  ppsspp = mkLibRetroCore rec {
     core = "ppsspp";
-    src = fetchFromGitHub {
-      owner = "hrydgard";
-      repo = "ppsspp";
-      rev = "v1.11";
-      fetchSubmodules = true;
-      sha256 = "sha256-vfp/vacIItlPP5dR7jzDT7oOUNFnjvvdR46yi79EJKU=";
-    };
-    patches = [
-      (fetchpatch {
-        name = "fix_ffmpeg_4.4.patch";  # to be removed with next release
-        url = "https://patch-diff.githubusercontent.com/raw/hrydgard/ppsspp/pull/14176.patch";
-        sha256 = "sha256-ecDoOydaLfL6+eFpahcO1TnRl866mZZVHlr6Qrib1mo=";
-      })
-    ];
+    src = getCoreSrc core;
     description = "ppsspp libretro port";
     license = gpl2;
     extraNativeBuildInputs = [ cmake pkg-config python3 ];
@@ -857,11 +678,7 @@ in with lib.licenses;
 
   prboom = mkLibRetroCore rec {
     core = "prboom";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "991016b3c7a9c8b0e49b2bc9c72f68c60800fc7b";
-      sha256 = "1abv9qgfvh3x84shgyl3y90bjz77mjj17vibag7bg6i8hgjikjgq";
-    };
+    src = getCoreSrc core;
     description = "Prboom libretro port";
     license = gpl2;
     makefile = "Makefile";
@@ -869,23 +686,15 @@ in with lib.licenses;
 
   prosystem = mkLibRetroCore rec {
     core = "prosystem";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "6f7e34aea89db5ba2fbf674e5ff0ad6fc68a198e";
-      sha256 = "0pqkb0f51s8ma0l4m9xk2y85z2kh3fgay9g4g8fingbgqq1klvzs";
-    };
+    src = getCoreSrc core;
     description = "Port of ProSystem to libretro";
     license = gpl2;
     makefile = "Makefile";
   };
 
-  quicknes = mkLibRetroCore {
+  quicknes = mkLibRetroCore rec {
     core = "quicknes";
-    src = fetchRetro {
-      repo = "QuickNES_Core";
-      rev = "31654810b9ebf8b07f9c4dc27197af7714364ea7";
-      sha256 = "15fr5a9hv7wgndb0fpmr6ws969him41jidzir2ix9xkb0mmvcm86";
-    };
+    src = getCoreSrc core;
     description = "QuickNES libretro port";
     license = lgpl21Plus;
     makefile = "Makefile";
@@ -893,11 +702,7 @@ in with lib.licenses;
 
   sameboy = mkLibRetroCore rec {
     core = "sameboy";
-    src = fetchRetro {
-      repo = "sameboy";
-      rev = "c9e547c1063fd62c40a4b7a86e7db99dc9089051";
-      sha256 = "0bff6gicm24d7h270aqvgd8il6mi7j689nj5zl9ij0wc77hrrpmq";
-    };
+    src = getCoreSrc core;
     description = "SameBoy libretro port";
     license = mit;
     extraNativeBuildInputs = [ which hexdump ];
@@ -907,11 +712,7 @@ in with lib.licenses;
 
   scummvm = mkLibRetroCore rec {
     core = "scummvm";
-    src = fetchRetro {
-      repo = core;
-      rev = "de91bf9bcbf4449f91e2f50fde173496a2b52ee0";
-      sha256 = "06h9xaf2b1cjk85nbslpjj0fm9iy9b2lxr1wf3i09hgs4sh6x464";
-    };
+    src = getCoreSrc core;
     description = "Libretro port of ScummVM";
     license = gpl2;
     extraBuildInputs = [ fluidsynth libjpeg libvorbis libGLU libGL SDL ];
@@ -921,23 +722,14 @@ in with lib.licenses;
 
   smsplus-gx = mkLibRetroCore rec {
     core = "smsplus";
-    src = fetchRetro {
-      repo = core + "-gx";
-      rev = "36c82768c03d889f1cf4b66369edac2297acba32";
-      sha256 = "1f9waikyp7kp2abb76wlv9hmf2jpc76zjmfqyc7wk2pc70ljm3l4";
-    };
+    src = getCoreSrc "smsplus-gx";
     description = "SMS Plus GX libretro port";
     license = gpl2Plus;
   };
 
   snes9x = mkLibRetroCore rec {
     core = "snes9x";
-    src = fetchFromGitHub {
-      owner = "snes9xgit";
-      repo = core;
-      rev = "bd9246ddd75a5e9f78d6189c8c57754d843630f7";
-      sha256 = "10fm7ah3aha9lf4k9hgw0dlhdvshzpig2d0ylcb12gf9zz0i22ns";
-    };
+    src = getCoreSrc core;
     description = "Port of SNES9x git to libretro";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -946,11 +738,7 @@ in with lib.licenses;
 
   snes9x2002 = mkLibRetroCore rec {
     core = "snes9x2002";
-    src = fetchRetro {
-      repo = core;
-      rev = "a869da7f22c63ee1cb316f79c6dd7691a369da3e";
-      sha256 = "11lcwscnxg6sk9as2xlr4nai051qhidbsymyis4nz3r4dmgzf8j8";
-    };
+    src = getCoreSrc core;
     description = "Optimized port/rewrite of SNES9x 1.39 to Libretro";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -958,11 +746,7 @@ in with lib.licenses;
 
   snes9x2005 = mkLibRetroCore rec {
     core = "snes9x2005";
-    src = fetchRetro {
-      repo = core;
-      rev = "c216559b9e0dc3d7f059dcf31b813402ad47fea5";
-      sha256 = "19b2rpj6i32c34ryvlna4yca84y5ypza78w4x9l17qlhp021h9pv";
-    };
+    src = getCoreSrc core;
     description = "Optimized port/rewrite of SNES9x 1.43 to Libretro";
     license = "Non-commercial";
     makefile = "Makefile";
@@ -972,23 +756,14 @@ in with lib.licenses;
 
   snes9x2010 = mkLibRetroCore rec {
     core = "snes9x2010";
-    src = fetchRetro {
-      repo = core;
-      rev = "ba9f2240360f8db270fb6ba5465c79c317070560";
-      sha256 = "00y53sjrsp8sccpp1qqw88iawsz30g6d370cbqcxs4ya1r6awn5x";
-    };
+    src = getCoreSrc core;
     description = "Optimized port/rewrite of SNES9x 1.52+ to Libretro";
     license = "Non-commercial";
   };
 
   stella = mkLibRetroCore rec {
     core = "stella";
-    src = fetchFromGitHub {
-      owner = "stella-emu";
-      repo = core;
-      rev = "506bb0bd0618e676b1959931dcc00a9d0f5f0f3d";
-      sha256 = "09nclx0ksixngnxkkjjcyhf3d0vl4ykm8fx7m307lvag8nxj7z03";
-    };
+    src = getCoreSrc core;
     description = "Port of Stella to libretro";
     license = gpl2;
     extraBuildInputs = [ libpng pkg-config SDL ];
@@ -999,11 +774,7 @@ in with lib.licenses;
 
   stella2014 = mkLibRetroCore rec {
     core = "stella2014";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "fc87f2c78d3b177f4b9b19698557dce452ac3ce7";
-      sha256 = "0yqzavk1w0d0ngpls32c4wlihii97fz2g6zsgadhm48apwjvn3xx";
-    };
+    src = getCoreSrc core;
     description = "Port of Stella to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -1011,11 +782,7 @@ in with lib.licenses;
 
   tgbdual = mkLibRetroCore rec {
     core = "tgbdual";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "9be31d373224cbf288db404afc785df41e61b213";
-      sha256 = "19m3f3hj3jyg711z1xq8qn1hgsr593krl6s6hi0r6vf8p5x0zbzw";
-    };
+    src = getCoreSrc core;
     description = "Port of TGBDual to libretro";
     license = gpl2;
     makefile = "Makefile";
@@ -1023,11 +790,7 @@ in with lib.licenses;
 
   thepowdertoy = mkLibRetroCore rec {
     core = "thepowdertoy";
-    src = fetchRetro {
-      repo = "ThePowderToy";
-      rev = "0ff547e89ae9d6475b0226db76832daf03eec937";
-      sha256 = "kDpmo/RPYRvROOX3AhsB5pIl0MfHbQmbyTMciLPDNew=";
-    };
+    src = getCoreSrc core;
     description = "Port of The Powder Toy to libretro";
     license = gpl3Only;
     extraNativeBuildInputs = [ cmake ];
@@ -1035,16 +798,12 @@ in with lib.licenses;
     postBuild = "cd src/";
   };
 
-  tic80 = mkLibRetroCore {
+  tic80 = mkLibRetroCore rec {
     core = "tic80";
-    src = fetchRetro {
-      repo = "tic-80";
-      rev = "f43bad908d5f05f2a66d5cd1d6f21b234d4abd2c";
-      sha256 = "0bp34r8qqyw52alws1z4ib9j7bs4d641q6nvqszd07snp9lpvwym";
-    };
+    src = getCoreSrc core;
     description = "Port of TIC-80 to libretro";
     license = mit;
-    extraNativeBuildInputs = [ cmake pkg-config ];
+    extraNativeBuildInputs = [ cmake pkg-config libGL libGLU ];
     makefile = "Makefile";
     cmakeFlags = [
       "-DBUILD_LIBRETRO=ON"
@@ -1059,22 +818,14 @@ in with lib.licenses;
 
   vba-next = mkLibRetroCore rec {
     core = "vba-next";
-    src = fetchRetro {
-      repo = core;
-      rev = "019132daf41e33a9529036b8728891a221a8ce2e";
-      sha256 = "0hab4rhvvcg30jifd9h9jq5q2vqk2hz5i1q456w6v2d10hl1lf15";
-    };
+    src = getCoreSrc core;
     description = "VBA-M libretro port with modifications for speed";
     license = gpl2;
   };
 
   vba-m = mkLibRetroCore rec {
     core = "vbam";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "7d88e045a2fe44e56b3f84846beec446b4c4b2d9";
-      sha256 = "04f8adg99a36qkqhij54vkw5z18m5ld33p78lbmv8cxk7k7g7yhy";
-    };
+    src = getCoreSrc "vba-m";
     description = "vanilla VBA-M libretro port";
     license = gpl2;
     makefile = "Makefile";
@@ -1083,22 +834,15 @@ in with lib.licenses;
 
   vecx = mkLibRetroCore rec {
     core = "vecx";
-    src = fetchRetro {
-      repo = "libretro-" + core;
-      rev = "321205271b1c6be5dbdb8d309097a5b5c2032dbd";
-      sha256 = "1w54394yhf2yqmq1b8wi5y7lvixc5hpjxpyiancrdbjd0af7pdvd";
-    };
+    src = getCoreSrc core;
     description = "Port of Vecx to libretro";
     license = gpl3;
+    extraBuildInputs = [ libGL libGLU ];
   };
 
   virtualjaguar = mkLibRetroCore rec {
     core = "virtualjaguar";
-    src = fetchRetro {
-      repo = core + "-libretro";
-      rev = "a162fb75926f5509f187e9bfc69958bced40b0a6";
-      sha256 = "06k8xpn5y9rzmi2lwfw0v9v9pz4wvmpalycc608bw9cl39lmz10h";
-    };
+    src = getCoreSrc core;
     description = "Port of VirtualJaguar to libretro";
     license = gpl3;
     makefile = "Makefile";
@@ -1106,11 +850,7 @@ in with lib.licenses;
 
   yabause = mkLibRetroCore rec {
     core = "yabause";
-    src = fetchRetro {
-      repo = core;
-      rev = "9be109f9032afa793d2a79b837c4cc232cea5929";
-      sha256 = "0aj862bs4dmnldy62wdssj5l63ibfkbzqvkxcqa3wyvdz4i367jc";
-    };
+    src = getCoreSrc core;
     description = "Port of Yabause to libretro";
     license = gpl2;
     makefile = "Makefile";
diff --git a/pkgs/misc/emulators/retroarch/hashes.json b/pkgs/misc/emulators/retroarch/hashes.json
new file mode 100644
index 000000000000..f0a119c6ef5f
--- /dev/null
+++ b/pkgs/misc/emulators/retroarch/hashes.json
@@ -0,0 +1,513 @@
+{
+    "atari800": {
+        "owner": "libretro",
+        "repo": "libretro-atari800",
+        "rev": "478a8ec99a7f8436a39d5ac193c5fe313233ee7b",
+        "sha256": "LJpRegJVR2+sS1UmTTpVest0rMrNDBMXmj/jRFVglWI=",
+        "fetchSubmodules": false
+    },
+    "beetle-snes": {
+        "owner": "libretro",
+        "repo": "beetle-bsnes-libretro",
+        "rev": "bc867656d7438aaffc6818b3b92350587bc78a47",
+        "sha256": "TyUCRGK+uyXowDjXW9/4m+zL8Vh/3GGsX1eznrTCbAg=",
+        "fetchSubmodules": false
+    },
+    "beetle-gba": {
+        "owner": "libretro",
+        "repo": "beetle-gba-libretro",
+        "rev": "38182572571a48cb58057cde64b915237c4e2d58",
+        "sha256": "4xnXWswozlcXBNI1lbGSNW/gAdIeLLO9Bf1SxOFLhSo=",
+        "fetchSubmodules": false
+    },
+    "beetle-lynx": {
+        "owner": "libretro",
+        "repo": "beetle-lynx-libretro",
+        "rev": "b84c79b2f185482f9cec2b10f33cbe1bc5732dd9",
+        "sha256": "pR3EsFN/Wf77gPoAnjf/nI0XlB2098qIrmbdjB4jmMQ=",
+        "fetchSubmodules": false
+    },
+    "beetle-ngp": {
+        "owner": "libretro",
+        "repo": "beetle-ngp-libretro",
+        "rev": "f969af2b52f20642aea7e800e3cfcce728f3aee9",
+        "sha256": "GIzLZ3iOJeHKdAowhM4S56iouaxX8v2XZgc/ZiCzCPk=",
+        "fetchSubmodules": false
+    },
+    "beetle-pce-fast": {
+        "owner": "libretro",
+        "repo": "beetle-pce-fast-libretro",
+        "rev": "81d4c9d07a76c89c32ad0e7450b69bde6403836f",
+        "sha256": "LhQbAEUMhoIF3VfwLbhtD7xxSddzdgwIHHnSabQPAvs=",
+        "fetchSubmodules": false
+    },
+    "beetle-pcfx": {
+        "owner": "libretro",
+        "repo": "beetle-pcfx-libretro",
+        "rev": "a1f1734509dd6acb11269f118d61f480ae8dbacf",
+        "sha256": "rvRDuYJLxb1TSwNXhp3ATJW0sQgWi8Cj4NR3hep/AJk=",
+        "fetchSubmodules": false
+    },
+    "beetle-psx": {
+        "owner": "libretro",
+        "repo": "beetle-psx-libretro",
+        "rev": "ccca81930a078c0efd77b00327d2ee212698f3b4",
+        "sha256": "Hy8Zrp0kTR+Mfbq0nVYerSarRCxZI+ykgDOscakDMiU=",
+        "fetchSubmodules": false
+    },
+    "beetle-saturn": {
+        "owner": "libretro",
+        "repo": "beetle-saturn-libretro",
+        "rev": "e1119e91a4e3f4b30971455aeb3c1a6f4cd05e59",
+        "sha256": "lKlNNAHK1ynFXY++Ya0m1Ax5YTZkd44eQjzuOLXfWa8=",
+        "fetchSubmodules": false
+    },
+    "beetle-supergrafx": {
+        "owner": "libretro",
+        "repo": "beetle-supergrafx-libretro",
+        "rev": "59062662d6e925ad512fcbb9c1a0db97d1592bc1",
+        "sha256": "kGyl5XJMFUALPAEZf4IynY6bmXWfqy0o65eO8zS0RTE=",
+        "fetchSubmodules": false
+    },
+    "beetle-wswan": {
+        "owner": "libretro",
+        "repo": "beetle-wswan-libretro",
+        "rev": "0c7faaf7f70b72ebb68e310530cd46a69e680d40",
+        "sha256": "UQyICcZe1DVotSFt0QVnGop+JG5NJwTBcGSZaFW0P0U=",
+        "fetchSubmodules": false
+    },
+    "beetle-vb": {
+        "owner": "libretro",
+        "repo": "beetle-vb-libretro",
+        "rev": "1bd0da71c8f6add253ad76e2b6e1357cd09fc304",
+        "sha256": "KguKbRK0uXE+brpF8HdRwi8Gt76AMa4wkh1MFvNCbN4=",
+        "fetchSubmodules": false
+    },
+    "bluemsx": {
+        "owner": "libretro",
+        "repo": "bluemsx-libretro",
+        "rev": "cfc1df4d026387883f21994bcce603c4a6be8730",
+        "sha256": "ix/AyYNer1R73ZJW1reXyj7geBr3ThrqXf5Ki5yrz9A=",
+        "fetchSubmodules": false
+    },
+    "bsnes-mercury": {
+        "owner": "libretro",
+        "repo": "bsnes-mercury",
+        "rev": "d232c6ea90552f5921fec33a06626f08d3e18b24",
+        "sha256": "fpl7hmqz+Ca+9ZeM6E1JSikbiu+NJUU8xXtyl6Dd9Gg=",
+        "fetchSubmodules": false
+    },
+    "citra": {
+        "owner": "libretro",
+        "repo": "citra",
+        "rev": "b1959d07a340bfd9af65ad464fd19eb6799a96ef",
+        "sha256": "Tw6Niba9gsZOMKGaXF9AZ5gdigB0mmFyqoRTMElM/Ps=",
+        "fetchSubmodules": true
+    },
+    "desmume": {
+        "owner": "libretro",
+        "repo": "desmume",
+        "rev": "7ea0fc96804fcd9c8d33e8f76cf64b1be50cc5ea",
+        "sha256": "4S/CirRVOBN6PVbato5X5fu0tBn3Fu5FEAbdf3TBqng=",
+        "fetchSubmodules": false
+    },
+    "desmume2015": {
+        "owner": "libretro",
+        "repo": "desmume2015",
+        "rev": "cd89fb7c48c735cb321311fbce7e6e9889dda1ce",
+        "sha256": "9Ou/n6pxRjJOp/Ybpyg4+Simosj2X26kLZCMEqeVL6U=",
+        "fetchSubmodules": false
+    },
+    "dolphin": {
+        "owner": "libretro",
+        "repo": "dolphin",
+        "rev": "82e617439b622af5d1189e9fec67e7f1376be099",
+        "sha256": "Q3a+0SYocX1hBGLs1K9r932NkiCDFINPhtHeyzUknJE=",
+        "fetchSubmodules": false
+    },
+    "dosbox": {
+        "owner": "libretro",
+        "repo": "dosbox-libretro",
+        "rev": "aa71b67d54eaaf9e41cdd3cb5153d9cff0ad116e",
+        "sha256": "L0Y67UROjldnXUlLQ+Xbd7RHLb96jDxlB/k+LR9Kbas=",
+        "fetchSubmodules": false
+    },
+    "eightyone": {
+        "owner": "libretro",
+        "repo": "81-libretro",
+        "rev": "30344d3499fdb301ee33de136f7b390bebe0756a",
+        "sha256": "kMwga9MkjV+dKxW3VLu+rxst6H20HhREoiNBsCLa1G0=",
+        "fetchSubmodules": false
+    },
+    "fbalpha2012": {
+        "owner": "libretro",
+        "repo": "fbalpha2012",
+        "rev": "23f98fc7cf4f2f216149c263cf5913d2e28be8d4",
+        "sha256": "dAInW6tTV7oXcPhKMnHWcmQaWQCTqRrYHD2yuaI1I1w=",
+        "fetchSubmodules": false
+    },
+    "fbneo": {
+        "owner": "libretro",
+        "repo": "fbneo",
+        "rev": "4d6387b7f3e3f1a9c25015789d751c6db1a9ae8c",
+        "sha256": "bIOmvhu9mOfOXoOTbwbjMHIZ3JkGz96yyFZALmqkOmk=",
+        "fetchSubmodules": false
+    },
+    "fceumm": {
+        "owner": "libretro",
+        "repo": "libretro-fceumm",
+        "rev": "a918869c18c9f30b84e04260b78b675b8a3c7be1",
+        "sha256": "nDYPrwIsvhWveDQDE0WEK7GO60iRE967p1XxXn+lNj4=",
+        "fetchSubmodules": false
+    },
+    "flycast": {
+        "owner": "libretro",
+        "repo": "flycast",
+        "rev": "ae670ea28fdbb9f08149cb598312a71a0970ca67",
+        "sha256": "jmSOfyak5mX04HgZOtCF9cz8HqAApxDXHJ6IqhqGILE=",
+        "fetchSubmodules": false
+    },
+    "fmsx": {
+        "owner": "libretro",
+        "repo": "fmsx-libretro",
+        "rev": "20c805409b8f6e1f9d61cb3dff0d5b28d82d1ee3",
+        "sha256": "uqqVF2+YpfWOKbe8aIreoImFb3/kL8ohslJkl+JivQI=",
+        "fetchSubmodules": false
+    },
+    "freeintv": {
+        "owner": "libretro",
+        "repo": "freeintv",
+        "rev": "0058a09492c5c17a4fa59ebb3601ce66844b3b25",
+        "sha256": "DA6eAl9ZR84Ow8rH9q/DVbEU83nmidwMy3kqk+hWWLQ=",
+        "fetchSubmodules": false
+    },
+    "gambatte": {
+        "owner": "libretro",
+        "repo": "gambatte-libretro",
+        "rev": "4b822bcf561856689e101dd5505d365de5ffcffe",
+        "sha256": "FsIQLd/UO5xs/aTpggSn8WLPgi83gsxRlwKR+UzH+TY=",
+        "fetchSubmodules": false
+    },
+    "genesis-plus-gx": {
+        "owner": "libretro",
+        "repo": "Genesis-Plus-GX",
+        "rev": "309a4aacfd582c312dcad61b7abfdffba4a0c66e",
+        "sha256": "jnbey1USldDZGXGXLLR5TgSJZgD+6ZFpwfIf6c8xvyM=",
+        "fetchSubmodules": false
+    },
+    "gpsp": {
+        "owner": "libretro",
+        "repo": "gpsp",
+        "rev": "a2aa78733d8daf1d550c9dc76c6ff94e8670b31c",
+        "sha256": "nKim7YkksUyZO97SvrW1TEYQlA+7Yi7xbLtyDPV4LWc=",
+        "fetchSubmodules": false
+    },
+    "gw": {
+        "owner": "libretro",
+        "repo": "gw-libretro",
+        "rev": "0f1ccca156388880bf4507ad44741f80945dfc6f",
+        "sha256": "BVpx8pL224J2u9W6UDrxzfEv4qIsh6wrf3bDdd1R850=",
+        "fetchSubmodules": false
+    },
+    "handy": {
+        "owner": "libretro",
+        "repo": "libretro-handy",
+        "rev": "e7b4e32d5f32d6e96630072072844a7dd16a02d9",
+        "sha256": "dQpEqxOcac7gdbmWu4HTvFx++us/spVMfroBlLTAgF0=",
+        "fetchSubmodules": false
+    },
+    "hatari": {
+        "owner": "libretro",
+        "repo": "hatari",
+        "rev": "cea06eebf695b078fadc0e78bb0f2b2baaca799f",
+        "sha256": "Z05IGubwdgg7X/e2ZG49zVfXuITM59HW/1gicdpDXls=",
+        "fetchSubmodules": false
+    },
+    "mame": {
+        "owner": "libretro",
+        "repo": "mame",
+        "rev": "031ac783585e7d5156a6f87a9ba20d88caf94ad6",
+        "sha256": "hLMQw5jvJTxojGwCY7iUDHcJdLZjcLzEDhW576TerJI=",
+        "fetchSubmodules": false
+    },
+    "mame2000": {
+        "owner": "libretro",
+        "repo": "mame2000-libretro",
+        "rev": "4793742b457945afb74053c8a895e6ff0b36b033",
+        "sha256": "DA9fZTic/jlYzSAIiOjfhohyEyQZiBNdIa8YCZoKZNs=",
+        "fetchSubmodules": false
+    },
+    "mame2003": {
+        "owner": "libretro",
+        "repo": "mame2003-libretro",
+        "rev": "d0ed1a565803cfada9f4088326eae616f6e5f8a3",
+        "sha256": "JGEy6Mp5qcZwaehzbj+qpdBfxHzqi6qIR7akxIj/WK8=",
+        "fetchSubmodules": false
+    },
+    "mame2003-plus": {
+        "owner": "libretro",
+        "repo": "mame2003-plus-libretro",
+        "rev": "841e44dff953a346127f15be53cb34778e20ce1c",
+        "sha256": "aCXyeDcz0uSObe4S2bQWCxIAF5aA3kne5v0HT+oXHuw=",
+        "fetchSubmodules": false
+    },
+    "mame2010": {
+        "owner": "libretro",
+        "repo": "mame2010-libretro",
+        "rev": "932e6f2c4f13b67b29ab33428a4037dee9a236a8",
+        "sha256": "HSZRSnc+0300UE9fPcUOMrXABlxHhTewkFPTqQ4Srxs=",
+        "fetchSubmodules": false
+    },
+    "mame2015": {
+        "owner": "libretro",
+        "repo": "mame2015-libretro",
+        "rev": "ef41361dc9c88172617f7bbf6cd0ead4516a3c3f",
+        "sha256": "HZrw9KKwYAJyU4NH1BEvuod/TK/nqjN03qJuSX8JP8o=",
+        "fetchSubmodules": false
+    },
+    "mame2016": {
+        "owner": "libretro",
+        "repo": "mame2016-libretro",
+        "rev": "d53c379892b0bd91b4a52fc2de491e1199f03e32",
+        "sha256": "GQ4Sdg/1nZRT4Z1Aqq1zPo96duqIGyt6sjghf9ap2Jg=",
+        "fetchSubmodules": false
+    },
+    "mesen": {
+        "owner": "SourMesen",
+        "repo": "mesen",
+        "rev": "86326e832974d984846ae078e568c023a5f76f1f",
+        "sha256": "At5rhlJ6rAnXaQrmRA1NtCCi+Ff/ytlt5dwsaXZhxXg=",
+        "fetchSubmodules": false
+    },
+    "meteor": {
+        "owner": "libretro",
+        "repo": "meteor-libretro",
+        "rev": "e533d300d0561564451bde55a2b73119c768453c",
+        "sha256": "zMkgzUz2rk0SD5ojY4AqaDlNM4k4QxuUxVBRBcn6TqQ=",
+        "fetchSubmodules": false
+    },
+    "mgba": {
+        "owner": "libretro",
+        "repo": "mgba",
+        "rev": "033e067285745909722df930deaeead80ea2d54a",
+        "sha256": "ZFmiVOf8H3PtSCWTtYc3XsIpiJI6XZ2v/HsusQsg7H8=",
+        "fetchSubmodules": false
+    },
+    "mupen64plus": {
+        "owner": "libretro",
+        "repo": "mupen64plus-libretro-nx",
+        "rev": "018ee72b4fe247b38ed161033ad12a19bb936f00",
+        "sha256": "vJz9S9lUgJp8O0NgJF6/EYymFqwZefvrT/HJLpMhgEk=",
+        "fetchSubmodules": false
+    },
+    "neocd": {
+        "owner": "libretro",
+        "repo": "neocd_libretro",
+        "rev": "83d10f3be10fff2f28aa56fc674c687528cb7f5c",
+        "sha256": "yYZGoMsUfE8cpU9i826UWQGi1l0zPJPcBDb2CINxGeQ=",
+        "fetchSubmodules": false
+    },
+    "nestopia": {
+        "owner": "libretro",
+        "repo": "nestopia",
+        "rev": "ea6f1c0631bb62bf15ab96493127dd9cfaf74d1c",
+        "sha256": "v+5000V1SR1sXWHryoZEi5sTgaRlVMrHmWKJX2stdSk=",
+        "fetchSubmodules": false
+    },
+    "np2kai": {
+        "owner": "AZO234",
+        "repo": "NP2kai",
+        "rev": "3e8fedc7c1c6f68faa26589187512474a766ee9e",
+        "sha256": "5bfh/aZOqfHz1x2s5AzZo4zq9qA4w10d9vYuuILdKJQ=",
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+}
\ No newline at end of file