[MacPorts] #54372: scidavis @1.14 isn't using the right compiler

[MacPorts]

#54372: scidavis @1.14 isn't using the right compiler
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  NicosPavlov
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  scidavis
------------------------+-------------------------
 scidavis is hardcoded to build with clang++; this fails on systems that
 don't have clang++ provided by Xcode, such as Snow Leopard and earlier.

 https://build.macports.org/builders/ports-10.5_ppc_legacy-
 builder/builds/33968:

 https://build.macports.org/builders/ports-10.6_x86_64_legacy-
 builder/builds/34520

 {{{
 make[1]: clang++: Command not found
 }}}

 scidavis should be UsingTheRightCompiler. If it requires clang, it should
 be blacklisting compilers that are not clang.

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Ticket URL: <https://trac.macports.org/ticket/54372>
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