[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 ryandesign@…):

 Using `-isystem` as you suggest does not appear to do anything. I can just
 as easily clear `configure.cppflags` and it works too. But I'm worried
 that it's then using the zlib.h in /usr/include but then still using the
 zlib.dylib in ${prefix}/lib, and, although these are the same version at
 present, this could change if a new version of zlib is released. But, I
 also still do not understand the `-isystem` option, and would still
 appreciate a pointer to any documentation explaining its purpose.

 I still think it's a bug that freetype looks for ftconfig.h in the path
 MacPorts indicates in CPPFLAGS, I have reported it to the authors of
 freetype, and I await their response.

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Ticket URL: <http://trac.macports.org/ticket/18232#comment:30>
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