[MacPorts] #46118: gmp pre-configure fails with "couldn't create error file for command"

[MacPorts]

#46118: gmp pre-configure fails with "couldn't create error file for command"
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  Reporter:  mgs0lid_sn4ke@…  |      Owner:  macports-tickets@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  base             |    Version:  2.3.3
Resolution:                   |   Keywords:
      Port:                   |
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Comment (by ryandesign@…):

 Yes you are using `sudo`, but MacPorts drops privileges to an unprivileged
 "macports" user. gmp's pre-configure block runs `exec`. According to my
 Google search, the error message can occur when `exec` tries to create a
 temporary file but does not have permission to do so, because the tmp
 directory is not world writable. The question is: which tmp
 directory—/tmp, /var/tmp, something in /var/folders? MacPorts creates a
 .tmp directory in the work directory, but Tcl might be using a different
 one; certainly the MacPorts-created one should have correct permissions.
 We've seen other errors before due to tmp directories in /var/folders
 mysteriously having wrong permissions, which were resolved by removing the
 offending directory and letting the system recreate it, possibly following
 a restart.

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Ticket URL: <https://trac.macports.org/ticket/46118#comment:2>
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