OK create 3 modules A, B & C in 3 separate files all in the same directory like so: A.pm: 
package A;

sub foo { print "xyzzy\n"; }

1;

[download]
B.pm: 
package B;
use base 'A';

1;

[download]
and C.pm: 
package C;
use base 'B';

1;

[download]
and now set up a 'test.pl': 
#!/usr/bin/perl

require 'C.pm';

C::foo();

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Run it and you get:

22. perl test.pl
Can't locate object method "foo" via package "C" at C.pm line 5.

Why doesn't it find the sub foo in 'A.pm'? I must be making a newbie mistake, but for the life of me I can't see what.

In reply to Inheritance strangeness by cleverett

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