You have to ->import the symbols in to your library:

use warnings;
use strict;

package MyStandardModules;
use Time::HiRes ();

package main;
Time::HiRes->import('gettimeofday');
print gettimeofday();
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I suggest either calling the function/method qualified with the namespace (ala my $time = Time::HiRes::gettimeofday()) or use()ing the module in the place you need the symbol imported.

Could you explain your adversion to use()ing the module in the package where the function is needed?