You need to link to the libraries that you used in your program. You used the native dialog addon so you now have to link your program to it. How depends on the compiler you're using.

Looks like you're on Linux if you're using pkg-config. The normal way to link a library is to use -lName, where Name is taken from libName.a. But you're using pkg-config and I'm not sure what the name for the dialog addon is in pkg-config.

Someone who uses pkg-config should be able to help you more.

Haha, no, you don't have to use it. Cut the `pkg-config --libs allegro_...` part out and run it in a terminal. You will see that all it does is output the actual linking commands.

Somebody should really put up a quick pkg-config guide on the wiki for use with allegro. Personally I never liked using pkg-config. It actually takes more typing to use pkg-config than to use the actual linking commands, but it is useful for showing you the right commands to use when linking allegro when you know the correct aliases for the libraries.

They're probably all named in a scheme similar to allegro_addon_name-5.X where in Nachos92's case it is probably allegro_native_dialog-5.0.

No I take that back, I think it is just allegro_dialog-5.0.

So the command would probably look like :

g++ -Wall -O2 -o progname main.cpp `pkg-config --libs allegro-5.0 allegro_dialog-5.0`

Personally in a similar case of use when there are a lot of libraries to link I just stuff all the link commands into an environment variable like %ALLEGRO_LIBS_STATIC% and then use that every time on the command line in the linking command.

Same goes for pkg-config, you don't really want to type all that shit out over and over again do you? Especially when you just want to do a quick test and you can't remember all the libs you need.

Thanks for your help!

I've tryed first with -I/usr/include/allegro5 but nothing.. then by adding "allegro_dialog-5.0" at the pkg-config line it worked!