[MacPorts] #20199: qt4-mac fails to build when conflicting ports are active

[MacPorts]

#20199: qt4-mac fails to build when conflicting ports are active
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  Reporter:  jwhowse4@…            |       Owner:  michaelld@…           
      Type:  defect                |      Status:  reopened              
  Priority:  Normal                |   Milestone:                        
 Component:  ports                 |     Version:  1.7.1                 
Resolution:                        |    Keywords:                        
      Port:  qt4-mac               |  
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Comment(by michaelld@…):

 An interesting side-effect of moving from using `-I`/`-L` to
 `CPATH`/`LIBRARY_PATH`, I'm 99% sure from testing today, and at least in
 qt4-* :

 The produced libraries no longer link with the MacPorts-provided `zlib`
 and `openssl` libraries (possibly others).  Why not?  There is no way to
 select them specifically during `configure`, and by default the system
 includes and libraries are found first because the MacPorts paths are
 searched last.  I came upon this issue when fixing some other ports during
 the qt4-* upgrade and wondered; so, now I think I know.

 Solution, IMHO: Either explicitly tell `configure` what headers and
 libraries to use, or, when that is not possible, make sure MacPorts paths
 are first in the search at least during `configure`.

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Ticket URL: <http://trac.macports.org/ticket/20199#comment:83>
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