anchor.diff:  { lib, stdenv, fetchFromGitHub, cmake, curl, openssl, zlib
  +, aws-c-common, aws-c-event-stream, aws-checksums
   , CoreAudio, AudioToolbox
   , # Allow building a limited set of APIs, e.g. ["s3" "ec2"].
     apis ? ["*"]
  
positive.code:   customMemoryManagement ? true
  }:
  
  let
    loaderVar =
      if stdenv.isLinux
        then "LD_LIBRARY_PATH"
        else if stdenv.isDarwin
          then "DYLD_LIBRARY_PATH"
          else throw "Unsupported system!";
  in stdenv.mkDerivation rec {
    name = "aws-sdk-cpp-${version}";
    version = "1.6.52";
  
    src = fetchFromGitHub {
      owner = "awslabs";
      repo = "aws-sdk-cpp";
      rev = version;
      sha256 = "17hyq6rv1xl3f70p2pfkkxm86gbfimq2pwpakv1wv3xjibmppbrf";
    };
  
    # FIXME: might be nice to put different APIs in different outputs
  
negative.code:   separateDebugInfo = stdenv.isLinux;
  
    nativeBuildInputs = [ cmake curl ];
  
    buildInputs = [
      curl openssl zlib
      aws-c-common aws-c-event-stream aws-checksums
    ] ++ lib.optionals (stdenv.isDarwin &&
                          ((builtins.elem "text-to-speech" apis) ||
                           (builtins.elem "*" apis)))
           [ CoreAudio AudioToolbox ];
  
    cmakeFlags = [
      "-DBUILD_DEPS=OFF"
      "-DCMAKE_SKIP_BUILD_RPATH=OFF"
    ] ++ lib.optional (!customMemoryManagement) "-DCUSTOM_MEMORY_MANAGEMENT=0"
      ++ lib.optional (stdenv.buildPlatform != stdenv.hostPlatform) "-DENABLE_TESTING=OFF"
      ++ lib.optional (apis != ["*"])
        "-DBUILD_ONLY=${lib.concatStringsSep ";" apis}";
  
    preConfigure =
      ''
        rm aws-cpp-sdk-core-tests/aws/auth/AWSCredentialsProviderTest.cpp
      '';
  
    __darwinAllowLocalNetworking = true;
  
    meta = with lib; {
      description = "A C++ interface for Amazon Web Services";
      homepage = https://github.com/awslabs/aws-sdk-cpp;
      license = licenses.asl20;
      platforms = platforms.unix;
      maintainers = with maintainers; [ eelco orivej ];
    };
  }
  