[MacPorts] #62828: py39-scipy @1.6.3 +gfortran+openblas can't read "configure.f77flags"

[MacPorts]

#62828: py39-scipy @1.6.3 +gfortran+openblas can't read "configure.f77flags"
-------------------------+------------------------
 Reporter:  snarkhunter  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.6.4
 Keywords:               |       Port:  py39-scipy
-------------------------+------------------------
 When building py39-scipy, I get the message

 --->  Building py39-scipy
 Error: Failed to build py39-scipy: can't read "configure.f77flags": no
 such variable

 Using Catalina 10.5.7

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Ticket URL: <https://trac.macports.org/ticket/62828>
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