[MacPorts] #57994: OpenBLAS compilation fails on MacBook Pro MacOS 10.14

[MacPorts]

#57994: OpenBLAS compilation fails on MacBook Pro MacOS 10.14
-------------------------+-------------------------
  Reporter:  Tim-at-AST  |      Owner:  NicosPavlov
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:  OpenBLAS    |
-------------------------+-------------------------

Comment (by Tim-at-AST):

 I have the command line tools only.


 {{{
 $ xcodebuild -version
 xcode-select: error: tool 'xcodebuild' requires Xcode, but active
 developer directory '/Library/Developer/CommandLineTools' is a command
 line tools instance

 $ xcode-select --install
 xcode-select: error: command line tools are already installed, use
 "Software Update" to install updates
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57994#comment:4>
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