[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:  reopened
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:  OpenBLAS    |
-------------------------+-------------------------
Changes (by dsavransky):

 * status:  closed => reopened
 * resolution:  worksforme =>


Comment:

 I'm having the exact same problem after updating to Xcode 11.  After the
 update I had a lot of issues with previously installed command line tools
 version, so I ended up removing those and am now trying to rely on Xcode
 only (which annoyingly only has the 10.15 SDK).  In any case, trying to
 install openblas +native produces the same "library not found for
 -lSystem" error, even though my ld64 port looks correct:
   ld64 @3_1+ld64_xcode (active) platform='darwin 18' archs='x86_64'
 date='2019-09-26T14:00:14-0400'
   ld64-xcode @2_1 (active) platform='darwin 18' archs='x86_64'
 date='2019-09-26T14:00:14-0400'

 Attaching the log.  Any ideas?  Thanks.

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Ticket URL: <https://trac.macports.org/ticket/57994#comment:22>
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