You could ask the Allegro Development list [1] how difficult porting Allegro 4 would be.
An alternative would be porting AGS to Allegro 5. [2]
[1] http://alleg.sourceforge.net/maillist.html
[2] http://www.adventuregamestudio.co.uk/forums/index.php?issue=355.0
An alternative would be porting AGS to Allegro 5. [2]
[1] http://alleg.sourceforge.net/maillist.html
[2] http://www.adventuregamestudio.co.uk/forums/index.php?issue=355.0