[MacPorts] #61236: OpenBLAS 0.3.10_1 +native Build Fails on MacOS 10.15.6 and Xcode 12.0

[MacPorts]

#61236: OpenBLAS 0.3.10_1 +native Build Fails on MacOS 10.15.6 and Xcode 12.0
-----------------------+-------------------------
  Reporter:  mascguy   |      Owner:  NicosPavlov
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.3
Resolution:            |   Keywords:
      Port:  OpenBLAS  |
-----------------------+-------------------------

Comment (by kencu):

 Thanks. Somehow, you have the incorrect version of {{{ld64}}} installed.
 For Catalina, the default is the {{{xcode}}} variant, which is what you
 need:
 {{{
 % port -v installed | grep ld64
   ld64 @3_3+ld64_xcode platform='darwin 19' archs='x86_64'
 date='2020-08-18T21:47:33-0700'
   ld64-xcode @2_3 platform='darwin 19' archs='x86_64'
 date='2020-08-18T21:47:32-0700'
 }}}

 to get that, you can do this:
 {{{
 sudo port -f uninstall ld64-latest
 sudo port -f uninstall ld64
 sudo port install ld64
 }}}

 and then you should be good to go. Please report back your success, and
 then we can close this ticket.

-- 
Ticket URL: <https://trac.macports.org/ticket/61236#comment:9>
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