Others may disagree with me on this, but for your example package Bar, id do the following instead: 
#File Bar.pm
use Foo;
package Bar;

sub make_bar
{
   main::make_foo(); # It is defined here.
   # do stuff
}

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Because then, Foo is not part of Bar::, but part of main::, which is probably what you really want. I say this because it sounds like you want package Foo to be able to be used independently of Bar, so it shouldnt ever be tied strictly to Bar, because once it is, thats the only place it'll get put...unless you do some serious hand-waving.

In reply to Re^2: constants in multiple libraries by shemp
in thread constants in multiple libraries by shemp

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