[MacPorts] #18232: freetype build fails if flow-tools is active

[MacPorts]

#18232: freetype build fails if flow-tools is active
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 Reporter:  fantunes@…           |       Owner:  ryandesign@…           
     Type:  defect               |      Status:  assigned               
 Priority:  Normal               |   Milestone:  Port Bugs              
Component:  ports                |     Version:  1.7.0                  
 Keywords:                       |        Port:  freetype               
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Comment(by mcalhoun@…):

 It seems to me that -isystem is exactly what we want in this
 situation.[[BR]]
 From man gcc:
 {{{
        -isystem dir
            Search dir for header files, after all directories specified by
 -I
            but before the standard system directories.  Mark it as a
 system
            directory, so that it gets the same special treatment as is
 applied
            to the standard system directories.
 }}}
 The correct ftconfig.h is found because the -I used in the build directory
 will take precedence over -isystem${prefix}.
 zlib.h will not be found in /usr/include because -isystem takes precedence
 over standard system directories.

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Ticket URL: <http://trac.macports.org/ticket/18232#comment:31>
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