Hi,flint is in fact already in debian, with 2.4.4-2 in testing and unstable, and 2.4.5-1 in experimental.
This last version has a serious bug: it fails to upgrade from sid (#779584), so I have pushed a 2.4.5-2 in debian-science's git, which fixes the problem.
I'm looking for a sponsor to upload this bugfix in experimental. Thanks, Snark on #debian-science