[MacPorts] #65011: cargo: 0.61.1 fails to build for 10.12 and earlier

[MacPorts]

#65011: cargo: 0.61.1 fails to build for 10.12 and earlier
----------------------+-------------------------
  Reporter:  mascguy  |      Owner:  herbygillot
      Type:  defect   |     Status:  assigned
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:  2.7.2
Resolution:           |   Keywords:
      Port:  cargo    |
----------------------+-------------------------

Comment (by MarcusCalhoun-Lopez):

 I believe it is a bit difficult to get Rust to look in the right place for
 OpenSSL.\\
 In the current [https://github.com/macports/macports-ports/pull/14277 pull
 request], it is handled in the rust PG.

 The current problem is that\\
 `MACPORTS_LEGACY_SUPPORT_LDFLAGS=-L/opt/local/lib
 -lMacportsLegacySupport`\\
 places `/opt/local/lib` very high in the search order for libraries.\\
 So `-lcrypto` finds `/opt/local/lib/libcrypto.dylib` instead of the
 intended `/opt/local/libexec/openssl11/lib/libcrypto.dylib`.

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Ticket URL: <https://trac.macports.org/ticket/65011#comment:12>
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