equivalent of *BSD's 'make world' in debian?

[Brent Verner <brent@linux1.org>]

ok, i've been cheating... i installed freebsd (though i rarely 
find cause to boot it). one thing i _really_ like about it is
being able to do a 'make world', which retreives a current source
tree and compiles it -- this is nice, because i like being able
to compile the whole system with gcc optimizations, as opposed
to using a binary compiled w/o aggressive optimization (call me
stupid, it's ok). 

is there any way to use debian's package system to do a from-
source upgrade?

on the same note, is there some way of making a debian CD with
pentium optimizations? i'd really like one of those to install
my next boxen from.


thanks
brent