[MacPorts] #54666: MacVim 136 build failure.

[MacPorts]

#54666: MacVim 136 build failure.
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 Reporter:  enxio   |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  MacVim
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 There's a build failure in MacVim/MMBackend.m, some explicit casts are
 lacking according to the compiler errors.

 I'm attaching a patch.

 Note that the same errors were also present in the last drops of MacVim.

 I'm running  10.12.6, FWIW.

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Ticket URL: <https://trac.macports.org/ticket/54666>
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