How to generete allegro5 tags for vim with ctags?

I was recently working on project with GTK2 in vim (with OmniCppComplete plugin). I generated tags with:

ctags -R --c++-kinds=+p --fields=+iaS --extra=+q --sort=yes /usr/include/gkt-2.0/

I did so for cairo and other libraries I needed. Everything was fine, I had all suggestions for all functions with needed arguments and their types.

I wanted to have some fun with allegro5 library, so I generated tags in the same way (allegro5 instead gtk-2.0) and I have completions only for 5 functions. What I did wrong, can you help me?

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