anchor.diff: -{ lib, stdenv
  +{ lib
  +, stdenv
   , fetchFromGitHub
   , aws-c-cal
   , aws-c-common
  
positive.code:     "-DBUILD_SHARED_LIBS=ON"
    ];
  
    meta = with lib; {
      description = "C99 implementation of the MQTT 3.1.1 specification";
      homepage = "https://github.com/awslabs/aws-c-mqtt";
  
negative.code: , aws-c-http
  , aws-c-io
  , cmake
  , nix
  , s2n-tls
  }:
  
  stdenv.mkDerivation rec {
    pname = "aws-c-mqtt";
    version = "0.7.12";
  
    src = fetchFromGitHub {
      owner = "awslabs";
      repo = "aws-c-mqtt";
      rev = "v${version}";
      sha256 = "sha256-0u3t0m5GQ7wxxLI8rY7j9AMliPzrAR9J/c/7DcT43WU=";
    };
  
    nativeBuildInputs = [
  