I may not be understanding the question fully but, since gmtime() is a Perl built-in... I doubt that @INC is the source of your problem. Is the name of your module gmtime.pm? Does your module define a gmtime subroutine? Maybe an example of the offending code would shed some more light on the problem.

I did just notice you said &gmtime() ... that would mean that gmtime must be a subroutine defined somewhere as

sub gmtime() {
  #do something
}
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I did a quick test with the following...

#!/usr/bin/perl
print scalar gmtime,"\n";
print &gmtime;
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which yielded:
Tue Jun 20 00:52:23 2000
Undefined subroutine &main::gmtime called at ...blah blah

ase
I try to help more, realize how little I know. Who is real student? -(my perlmonk haiku for the day)