Re-added support for pkg-config.

[carlos-jenkins]

This should fix issue #44

For your consideration.

[mfontanini]

Thanks for this. One question: the Cflags attribute you set is:

Cflags: -I${includedir}/tins

Shouldn't this be just -I${includedir}? I expect projects to be able to include the path "tins/tins.h" rather than "tins.h".

[carlos-jenkins]

Cflags: -I${includedir}/tins

Was the way it was in old autotools file. I compiled the arpmonitor.cpp example using both:

g++ --std=c++11 -I/usr/local/include arpmonitor.cpp `pkg-config --libs libtins` -o arpmonitor
g++ --std=c++11 `pkg-config --cflags libtins` arpmonitor.cpp -o arpmonitor `pkg-config --libs libtins`

arpmonitor.cpp uses #include "tins/tins.h"

 sudo LD_LIBRARY_PATH=/usr/local/lib ./arpmonitor eth0

And both seems to work fine. Nevertheless, I not sure why. I assume because /usr/local/include is maybe included by default? [*]

When I changed in arpmonitor.cpp to use #include "tins.h" (which is not recommended) the following happened:

This failed:

g++ --std=c++11 -I/usr/local/include arpmonitor.cpp `pkg-config --libs libtins` -o arpmonitor
arpmonitor.cpp:30:18: fatal error: tins.h: No such file or directory
 #include <tins.h>
                  ^
compilation terminated.

But this succeeded:

g++ --std=c++11 `pkg-config --cflags libtins` arpmonitor.cpp -o arpmonitor `pkg-config --libs libtins`

At this point I think is up to you if you want to enforce the use of the namespaced include (which I think is a good idea) or not.

Regards,