Allegro in Ubuntu: undefined reference to `al_install_system'

Question

I tried installing the Allegro library today. I have same experience in C++, but it seems I have none in doing stuff like that. I have compiled Allegro 5.0 from source and p

Answer 1

Allegro 5 uses pkg-config.

gcc foo.c -o foo $(pkg-config --libs allegro-5.0)

You will also need to specify addon libraries that you use:

gcc foo.c -o foo $(pkg-config --libs allegro-5.0 allegro_image-5.0)

Answer 2

You need to link with the Allegro libraries, but you don't seem to do so.

allegro-config --libs returns nothing.

There's part of your problem. Normally, you should be able to add it to your command line, like so:

g++ `allegro-config --libs` test2.cc -o test2

On my system (Ubuntu 10.10) it gives this:

$ allegro-config --libs
-L/usr/lib -Wl,-Bsymbolic-functions -lalleg-4.2.2

Are you invoking the right allegro-config? Maybe you should specify the full path to it?