[MacPorts] #38654: exim @4.71_2 does not build with clang. Builds with gcc

[MacPorts]

#38654: exim @4.71_2  does not build with clang.   Builds with gcc
-----------------------------+--------------------------------
  Reporter:  dave.evans55@…  |      Owner:  macports-tickets@…
      Type:  defect          |     Status:  reopened
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.1.99
Resolution:                  |   Keywords:
      Port:  exim            |
-----------------------------+--------------------------------
Changes (by jmr@…):

 * status:  closed => reopened
 * resolution:  duplicate =>
 * port:   => exim


Comment:

 It is the same issue as discussed in #37834, but caused in this case by
 exim's build system explicitly setting `TMPDIR="/tmp"`.

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Ticket URL: <https://trac.macports.org/ticket/38654#comment:4>
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