[MacPorts] #62767: librsvg @2.50.4 fails at configure during build

[MacPorts]

#62767: librsvg @2.50.4 fails at configure during build
------------------------+----------------------
  Reporter:  phosphide  |      Owner:  dbevans
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  librsvg    |
------------------------+----------------------

Comment (by kencu):

 For some reason, CC is getting messed up:
 {{{
 CC='/usr/bin/clang /usr/bin/clang'
 }}}

 and interprets this as an attempt to link against /usr/bin/clang.

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Ticket URL: <https://trac.macports.org/ticket/62767#comment:1>
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