anchor.diff:      avahi
       dbus
       gnutls
  -    kerberos
  +    #kerberos
       libgcrypt
       libpaper
       libusb
  
positive.code: , avahi
  , dbus
  , gnutls
  , kerberos
  , libgcrypt
  , libpaper
  , libusb
  
negative.code:     "--disable-debug-printfs"
      "--disable-unit-tests"
      #"--enable-relro"
      #(enFlag "gssapi" (kerberos != null) null)
      "--enable-threads"
      (enFlag "ssl" (
        gnutls != null
  