There is a GTK version of the community version available here: http://sourceforge.net/project/downloading.php?group_id=154065&use_mirror=voxel&filename=blitzmax-ide-linux-gtk-1.15.tar.gz&55415996
EDIT: That is sadly a very old version of the IDE though, you can try to get CVS (to get the most recent code) to work, but from what I've seen its a smelly beast to tackle.
EDIT: That is sadly a very old version of the IDE though, you can try to get CVS (to get the most recent code) to work, but from what I've seen its a smelly beast to tackle.