Thanks for your answer and suggestion.
I'm trying to compile a .cpp file using g++ and linking libraw, but i'm getting "undefined reference" error. This is the instruction that i'm using:

g++ ext-raw-dat.cpp -o extract -I/usr/local/include/libraw -L/usr/local/lib -lraw

can you tell me please what i am doing wrong?, at least please point me in the right direction, i know the solution must be plain simple, but i'm not really an expert and i don't see it.

Thanks in advance.