[MacPorts] #55991: esmf: Mistakenly (?) install openmpi-gcc7 with requested variants +openmpi +clang50

[MacPorts]

#55991: esmf: Mistakenly (?) install openmpi-gcc7 with requested variants +openmpi
+clang50
--------------------------+----------------------
  Reporter:  platipodium  |      Owner:  tenomoto
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  esmf         |
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Comment (by platipodium):

 Yes you're right.  My fault (and messing with local port file)

 Nonetheless, missing support for clang is an issue.  Please change
 {{{
 defect -> enhancement
 title -> Add support for clang
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55991#comment:2>
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