anchor.diff: -{ lib, stdenv, pkg-config, curl, darwin, libiconv, libgit2, libssh2,
  -  openssl, sqlite, zlib, dbus, dbus-glib, gdk-pixbuf, cairo, python3,
  -  libsodium, postgresql, gmp, foundationdb, capnproto, nettle, clang,
  -  llvmPackages, linux-pam, ... }:
  +{ lib
  +, stdenv
  +, pkg-config
  +, curl
  +, darwin
  +, libiconv
  +, libgit2
  +, libssh2
  +, openssl
  +, sqlite
  +, zlib
  +, dbus
  +, dbus-glib
  +, gdk-pixbuf
  +, cairo
  +, python3
  +, libsodium
  +, postgresql
  +, gmp
  +, foundationdb
  +, capnproto
  +, nettle
  +, clang
  +, llvmPackages
  +, linux-pam
  +, ...
  +}:
   
   let
     inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
  
positive.code:   libz-sys = attrs: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ zlib ];
      extraLinkFlags = ["-L${zlib.out}/lib"];
    };
  
    curl-sys = attrs: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ zlib curl ];
      propagatedBuildInputs = [ curl zlib ];
      extraLinkFlags = ["-L${zlib.out}/lib"];
    };
  
    dbus = attrs: {
  
negative.code: 
    rink = attrs: {
      buildInputs = [ gmp ];
      crateBin = [{ name = "rink"; path = "src/bin/rink.rs"; }];
    };
  
    security-framework-sys = attr: {
  