`allegro-config --libs`
(backquotes included), you have to put
-L/usr/lib -Wl, -Bsymbolic-functions -lalleg-4.2.2
`allegro-config --libs`
-L/usr/lib -Wl, -Bsymbolic-functions -lalleg-4.2.2
-L/usr/lib -lalleg-4.2.2
You can check the lib file for symbols.