Some notes on packaging:

Build-Depends:
  gcc (>= 4:4.1.1-7): Early gcc 4.0 versions miscompile calc on arm and m68k,
                      so let's give 4.1 a try on all archs.

OBSOLETE:
  gcc (>= 4:4.0.2-1): Early gcc 4 versions miscompile calc at least on i386
                      (#318362). 
                      Note that we could live with gcc < 4 on most archs, but
                      since all archs seem to have 4.0.2, we simplify B-D by
                      using it everywhere.

  gcc (>= 2:3.1) [m68k]: Previous gcc versions miscompile calc on m68k if
                         optimization is on (cf. #64832).
