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{ fetchFromGitHub, lib, stdenv, cmake, openssl, zlib, libuv }:

let
  generic = { version, sha256 }: stdenv.mkDerivation rec {
    pname = "libwebsockets";
    inherit version;

    src = fetchFromGitHub {
      owner = "warmcat";
      repo = "libwebsockets";
      rev = "v${version}";
      inherit sha256;
    };

    buildInputs = [ openssl zlib libuv ];

    nativeBuildInputs = [ cmake ];

    cmakeFlags = [
      "-DLWS_WITH_PLUGINS=ON"
      "-DLWS_WITH_IPV6=ON"
      "-DLWS_WITH_SOCKS5=ON"
    ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) "-DLWS_WITHOUT_TESTAPPS=ON";

    NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-Wno-error=unused-but-set-variable";

    meta = with lib; {
      description = "Light, portable C library for websockets";
      longDescription = ''
        Libwebsockets is a lightweight pure C library built to
        use minimal CPU and memory resources, and provide fast
        throughput in both directions.
      '';
      homepage = "https://libwebsockets.org/";
      # Relicensed from LGPLv2.1+ to MIT with 4.0. Licensing situation
      # is tricky, see https://github.com/warmcat/libwebsockets/blob/main/LICENSE
      license = with licenses; [ mit publicDomain bsd3 asl20 ];
      maintainers = with maintainers; [ mindavi ];
      platforms = platforms.all;
    };
  };

in
rec {
  libwebsockets_3_1 = generic {
    sha256 = "1w1wz6snf3cmcpa3f4dci2nz9za2f5rrylxl109id7bcb36xhbdl";
    version = "3.1.0";
  };

  libwebsockets_3_2 = generic {
    version = "3.2.2";
    sha256 = "0m1kn4p167jv63zvwhsvmdn8azx3q7fkk8qc0fclwyps2scz6dna";
  };

  libwebsockets_4_0 = generic {
    version = "4.0.21";
    sha256 = "01k05x4711ngin598jr9dag4ml3m7hi6pkgr4dsb02ryh1kc6146";
  };

  libwebsockets_4_1 = generic {
    version = "4.1.6";
    sha256 = "0x56v4hsx92vm1zibfmnqb5g3v23kzciffn3fjlsc3sly2pknhsg";
  };
}