[MacPorts] #59440: gsl @2.6: fatal error: 'gsl/gsl_block_char.h' file not found

[MacPorts]

#59440: gsl @2.6: fatal error: 'gsl/gsl_block_char.h' file not found
-------------------------+--------------------------
  Reporter:  ryandesign  |      Owner:  daitakahashi
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  gsl         |
-------------------------+--------------------------

Comment (by ryandesign):

 I agree... I can't explain it either. It only failed on our Mojave
 builder. I can't make it fail on my local Mojave machine.

 I've forced a new build of gsl on the Mojave builder. Let's see if that
 fails again. The builder is currently busy building other ports, but I
 think the new gsl build should end up being
 https://build.macports.org/builders/ports-10.14_x86_64-watcher/builds/10482
 in a few hours.

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Ticket URL: <https://trac.macports.org/ticket/59440#comment:2>
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