anchor.diff:  {
     cairo-rs = attrs: {
       buildInputs = [ cairo ];
  +  };
  +
  +  capnp-rpc = attrs: {
  +    nativeBuildInputs = [ capnproto ];
     };
   
     cargo = attrs: {
  
positive.code:     propagatedBuildInputs = [ Security ];
    };
  
    serde_derive = attrs: {
      buildInputs = stdenv.lib.optional stdenv.isDarwin Security;
    };
  
negative.code: { 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, ... }:
  
  let
    inherit (darwin.apple_sdk.frameworks) CoreFoundation Security;
  