I tried: 
use strict;
use warnings;
package MyMod::db;
use MyMod;
sub fred {
        print "hello" if (MYMOD_DEFAULT);
}
1;

[download]

but now I get:

Constant subroutine MyMod::MYMOD_DEFAULT redefined at /usr/local/lib/perl5/5.8.7/constant.pm line 103. Bareword "MYMOD_DEFAULT" not allowed while "strict subs" in use at MyMod/db.pm line 6. Compilation failed in require at MyMod.pm line 12. BEGIN failed--compilation aborted at MyMod.pm line 12.

In reply to Re^2: Can't import constants in multiple namespaces by mje
in thread Can't import constants in multiple namespaces by mje

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