[MacPorts] #57797: OpenBLAS @0.3.4_1 forces system AR and RANLIB but this errors on older systems

[MacPorts]

#57797: OpenBLAS @0.3.4_1 forces system AR and RANLIB but this errors on older
systems
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  Reporter:  kencu     |      Owner:  NicosPavlov
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  snowleopard leopard
      Port:  openblas  |
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Comment (by michaelld):

 I encountered this issue today when trying to get OpenBLAS to install on
 10.6 (along with that it uses the wrong compiler, but that's a different
 issue). My fix is to tweak the line in question to just read
 "AR=${prefix}/bin/ar" and "RANLIB=${prefix}/bin/ranlib" and then add
 "depends_build-append port:cctools". This works for me on 10.6 and 10.14
 ... so, guessing it will also on other Intel systems inbetween. I don't
 think OpenBLAS can compile on PPC anyway, so that would leave just OSX
 10.[45] Intel systems that I can't do testing on since I don't have an
 install available to do so. is this a reasonable solution?

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Ticket URL: <https://trac.macports.org/ticket/57797#comment:5>
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