[MacPorts] #62357: grace configuration fails

[MacPorts]

#62357: grace configuration fails
----------------------------+----------------------------
 Reporter:  valerie-vallet  |      Owner:  (none)
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:  MacPorts 2.7.0
Component:  ports           |    Version:  2.6.4
 Keywords:                  |       Port:
----------------------------+----------------------------
 **port install grace** crashes with

 ''Apple clang version 12.0.0 (clang-1200.0.32.29)
 Target: x86_64-apple-darwin20.3.0
 Thread model: posix
 InstalledDir: /Library/Developer/CommandLineTools/usr/bin
 configure:3235: $? = 0
 configure:3224: /usr/bin/clang -V >&5''

 I have Xcode 12.4 and Big Sur 11.2.1
 Thanks for fixing this

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Ticket URL: <https://trac.macports.org/ticket/62357>
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