anchor.diff:    };
   
     openssl-sys = attrs: {
  -    nativeBuildInputs = [ pkgconfig ];
  +    nativeBuildInputs = [ pkg-config ];
       buildInputs = [ openssl ];
     };
   
     pq-sys = attr: {
  -    nativeBuildInputs = [ pkgconfig ];
  +    nativeBuildInputs = [ pkg-config ];
       buildInputs = [ postgresql ];
     };
   
  
positive.code: { stdenv, pkgconfig, curl, darwin, libiconv, libgit2, libssh2,
    openssl, sqlite, zlib, dbus, dbus-glib, gdk-pixbuf, cairo, python3,
    libsodium, postgresql, gmp, foundationdb, ... }:
  
  
negative.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: {
      nativeBuildInputs = [ pkg-config ];
      buildInputs = [ dbus ];
    };
  
  