Tell compiler to look for include files

[onako]

I'm trying to extend someone's work, but without success in including his header files appropriately. Namely, I compile the code by using

g++ -o myprog $(pkg-config --cflags --libs libgraph libgvc cairo) source.cpp source.c

Now, I need to use the $ROOT/lib somehow to to tell the compiler to look in my
ROOT directory for include files. How should my new code used for compilation look like?

Thanks.

[brewbuck]

If headers are in $ROOT/include and libs in $ROOT/lib then just add "-I$ROOT/include -L$ROOT/lib" to the command.