[MacPorts] #42728: autogen @5.17.4_0: autoopts-config produces a stray -R flag, breaks gnutls @3.1.22_0 build

[MacPorts]

#42728: autogen @5.17.4_0: autoopts-config produces a stray -R flag, breaks gnutls
@3.1.22_0 build
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  Reporter:  jwhowse4@…      |      Owner:  mww@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.2.1
Resolution:                  |   Keywords:
      Port:  autogen gnutls  |
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Comment (by cal@…):

 Double checking I think it is a good idea to provide a `+dane` variant,
 since (a) `DANE` is (unfortunately) still not very widely used and (b)
 `unbound` depends on `openssl`, which would lead to the ironic situation
 of `gnutls` depending on `openssl`. Of course, this is the new
 maintainer's call in the end.

 I agree with your handling of the autogen dependency (i.e., using the
 local libopts).

 As for the trust store file, should we set that to the path of `curl-ca-
 bundle` or the file generated by `certsync`, i.e.
 `$prefix/etc/openssl/cert.pem`? Is the trust store format expected by
 GnuTLS compatible with the one used by OpenSSL? Pending further work on
 the followup to `certsync` we don't have a PKCS11 module, so that should
 stay empty for now.

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Ticket URL: <https://trac.macports.org/ticket/42728#comment:28>
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