anchor.diff:      "--disable-gtk-doc-pdf"
       "--${boolEn (gcr != null)}-gcr"
       "--enable-nls"
  +    "--${boolEn (polkit != null)}-admin"
       "--${boolEn (libsoup != null)}-http"
       "--${boolEn (avahi != null)}-avahi"
       "--${boolEn (systemd_lib != null)}-udev"
  
positive.code:     libsoup
      libxml2
      openssh
      samba_client
      systemd_lib
      udisks
  
negative.code: , libsoup
  , libxml2
  , openssh
  , polkit
  , samba_client
  , systemd_lib
  , udisks
  