Patching executables with presumed dynamically linked libarary locations (these systems that aren't nix lol)

libc_patchelf.nix

{ stdenv, lib, gcc-unwrapped }:
stdenv.mkDerivation rec {
  name = "mercurytcpclient";
  version = "0.0.1";
  src = ./.;

  dontUnpack = true;
  dontConfigure = true;
  dontBuild = true;

  installPhase = ''
    mkdir $out
    cp ${src}/mercurytcpclient $out
  '';
  preFixup = let
    # Include dependencies here.
    libPath = lib.makeLibraryPath [ gcc-unwrapped ];
  in ''
    patchelf \
      --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
      --set-rpath "${libPath}" \
      $out/mercurytcpclient
  '';

  meta = with lib; {
    homepage = "https://www.algoseek.com/";
    description = "a test client for connecting to algoseek";
    # license = licenses.unfree;
    platforms = platforms.linux;
    # maintainers = [ your_name ];
  };
}