anchor.diff:  
     outputs = [ "out" "dev" "devdoc" ];
   
  -  nativeBuildInputs = [ meson ninja pkg-config gobject-introspection vala gtk-doc docbook_xsl docbook_xml_dtd_412 ];
  +  nativeBuildInputs = [
  +    meson
  +    ninja
  +    pkg-config
  +    gobject-introspection
  +    vala
  +    gtk-doc
  +    docbook_xsl
  +    docbook_xml_dtd_412
  +  ];
   
  -  buildInputs = [ sqlite libsoup ];
  +  buildInputs = [
  +    sqlite
  +    libsoup
  +  ];
   
  -  propagatedBuildInputs = [ glib gtk3 cairo clutter-gtk ];
  +  propagatedBuildInputs = [
  +    glib
  +    gtk3
  +    cairo
  +    clutter-gtk
  +  ];
   
     mesonFlags = [
       "-Dgtk_doc=true"
  
positive.code: { fetchurl, lib, stdenv, meson, ninja, vala, gtk-doc, docbook_xsl, docbook_xml_dtd_412, pkg-config, glib, gtk3, cairo, sqlite, gnome
  , clutter-gtk, libsoup, gobject-introspection /*, libmemphis */ }:
  
  stdenv.mkDerivation rec {
    pname = "libchamplain";
  
negative.code:        OpenCycleMap, OpenAerialMap, and Maps for free.
      '';
  
      maintainers = teams.gnome.members;
      platforms = platforms.gnu ++ platforms.linux; # arbitrary choice
    };
  }
  