Change:
<ins> { alsa-lib , autoPatchelfHook , buildFHSEnv , dbus , elfutils , expat , extraEnv ? { } , fetchFromGitLab , fetchurl , glib , glibc , lib , libGL , libapparmor , libbsd , libedit , libffi_3_3 , libgcrypt , libglvnd , makeShellWrapper , sqlite , squashfsTools , stdenv , tcp_wrappers , udev , waylandpp , writeShellScript , xkeyboard_config , xorg , xz , zstd }: let pname = "plex-desktop"; version = "1.96.0"; rev = "69"; meta = { homepage = "https://plex.tv/"; description = "Streaming media player for Plex"; longDescription = '' Plex for Linux is your client for playback on the Linux desktop. It features the point and click interface you see in your browser but uses a more powerful playback engine as well as some other advance features. ''; maintainers = with lib.maintainers; [ detroyejr ]; license = lib.licenses.unfree; platforms = [ "x86_64-linux" ]; mainProgram = "plex-desktop"; }; # The latest unstable version isn't compatible with libraries that ship in the snap. libglvnd-1_4_0 = libglvnd.overrideAttrs { src = fetchFromGitLab { domain = "gitlab.freedesktop.org"; owner = "glvnd"; repo = "libglvnd"; rev = "v1.4.0"; sha256 = "sha256-Y6JHRygXcZtnrdnqi1Lzyvh/635gwZWnMeW9aRCpxxs"; }; }; plex-desktop = stdenv.mkDerivation { inherit pname version meta; src = fetchurl { url = "https://api.snapcraft.io/api/v1/snaps/download/qc6MFRM433ZhI1XjVzErdHivhSOhlpf0_${rev}.snap"; hash = "sha512-rECc8rK1ENAL5mXdabO8ynudCaSzz0yygOyg4gMbCtddgqwSOanP24/oguzPLr3zdRMC3VSf9B3hr2BGQ54tzg=="; }; nativeBuildInputs = [ squashfsTools ]; buildInputs = [ alsa-lib autoPatchelfHook dbus elfutils expat glib glibc libGL libapparmor libbsd libedit libffi_3_3 libgcrypt makeShellWrapper sqlite squashfsTools stdenv.cc.cc tcp_wrappers udev waylandpp xorg.libXinerama xz zstd ]; unpackPhase = '' runHook preUnpack unsquashfs "$src" cd squashfs-root runHook postUnpack ''; dontWrapQtApps = true; installPhase = '' runHook preInstall cp -r . $out ln -s ${libedit}/lib/libedit.so.0 $out/lib/libedit.so.2 rm $out/usr/lib/x86_64-linux-gnu/libasound.so.2 ln -s ${alsa-lib}/lib/libasound.so.2 $out/usr/lib/x86_64-linux-gnu/libasound.so.2 rm $out/usr/lib/x86_64-linux-gnu/libasound.so.2.0.0 ln -s ${alsa-lib}/lib/libasound.so.2.0.0 $out/usr/lib/x86_64-linux-gnu/libasound.so.2.0.0 runHook postInstall ''; }; in buildFHSEnv { name = "${pname}-${version}"; targetPkgs = pkgs: [ xkeyboard_config ]; extraInstallCommands = '' mkdir -p $out/share/applications $out/share/icons/hicolor/scalable/apps install -m 444 -D ${plex-desktop}/meta/gui/plex-desktop.desktop $out/share/applications/plex-desktop.desktop substituteInPlace $out/share/applications/plex-desktop.desktop  --replace-fail  'Icon=''${SNAP}/meta/gui/icon.png'  'Icon=${plex-desktop}/meta/gui/icon.png'  --replace-fail  'Exec=plex-desktop'  'Exec=plex-desktop-${version}' ''; runScript = writeShellScript "plex-desktop.sh" '' # Widevine won't download unless this directory exists. mkdir -p $HOME/.cache/plex/ PLEX_USR_PATH=${lib.makeSearchPath "usr/lib/x86_64-linux-gnu"  [ plex-desktop ]} set -o allexport LD_LIBRARY_PATH=${lib.makeLibraryPath [ plex-desktop libglvnd-1_4_0 ]}:$PLEX_USR_PATH LIBGL_DRIVERS_PATH=$PLEX_USR_PATH/dri ${lib.toShellVars extraEnv} exec ${plex-desktop}/Plex.sh ''; } </ins>

Discussion:
Project description Streaming media player for Plex Metadata homepage URL: source URL: license: proprietary platforms: linux Unfortunately, this app is only available as a Snap or a Flatpak. It looks like Snap is easier to unpack, as we have . There is also , which appears to be unmaintened.
would also appreciate this being packaged, the flatpak version does not start for me ( I don't like using flatpak anyways).
It also supports Darwin and Windows.
Just to be clear this is not this package This is a completely different package with different build steps that just looks the exact same.
Submitted a draft PR that adds this to nixpkgs. What's there now works on my machine&trade; (3 of them). I'd appreciate people testing this out on different hardware and suggesting any improvements that makes this more reliable. I have a couple more things I'd like to do before officially submitting this. Edit: Also need help with Darwin. I'm guessing it doesn't work there and I don't have a convenient way to test that platform.