[MacPorts] #67255: libsdl12 writes wrong pkgconfig settings in sdl.pc

[MacPorts]

#67255: libsdl12 writes wrong pkgconfig settings in sdl.pc
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  jmroot
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:
      Port:  libsdl12      |
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Comment (by ryandesign):

 Agreed. The install name is wrong too:
 {{{
 % otool -L /opt/local/libexec/libsdl12/lib/libSDL-1.2.0.dylib | head -n 2
 /opt/local/libexec/libsdl12/lib/libSDL-1.2.0.dylib:
         /opt/local/lib/libSDL-1.2.0.dylib (compatibility version 12.0.0,
 current version 12.5.0)
 }}}
 The port should probably tell the build system what places to install into
 at configure time rather than try to change it after the fact in the
 destroot phase.

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Ticket URL: <https://trac.macports.org/ticket/67255#comment:1>
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