'system cflags' with other prefix

[Craig Treleaven]

> On Jan 12, 2016, at 10:41 AM, Tollef Fog Heen <tfheen at err.no> wrote:
> 
> ]] Craig Treleaven 
> 
>> Eg, with MacPorts:
>> $ pkg-config --cflags x264
>> -I/opt/local/include                     ## want to make this disappear since it is the ‘system include'
> 
> If /opt/local/include is already on the compiler search path, pkg-config
> should be compiled with that knowledge, at which point it'll strip it
> out, like /usr/include on Linux.

I think pkg-config was built the way you suggest.  Following are the args supplied to pkg-config’s configure through the MacPorts build:

configure.args      --disable-silent-rules \
                    --disable-host-tool \
                    --with-pc-path=${prefix}/lib/pkgconfig:${prefix}/share/pkgconfig \
                    --with-internal-glib \
                    --docdir=${docdir}

https://trac.macports.org/browser/trunk/dports/devel/pkgconfig/Portfile#L34

${prefix} is /opt/local for a default install.

Should we be using some other configure arguments? 

Craig