I am trying to get a perl script to run my own installed module. I am getting the below message. Undefined subroutine &testdir::testsub called at call_module line 11.

Obviously, perl is telling you that the subroutine &testdir::testsub, used in line number 11 in your script is not available! Why? it was never "loaded".
Note is either you un-comment your this line:
# require '/home/sherman/build_dir/testdir/moduletest.pm'; or add use testdir::moduletest; indicating where the subroutine you used in line number 11 is located.
Please also check perlmod
Hope this helps.

## Update:

• I think this use V5.14.2; in your script should be use v5.14.2;
• Adding this use testdir::moduletest;
  You can just easily call your subrotrine like thus:
  my $moduletest = testsub(0,2,0,2);
  And you are good to go :)...
• it's also good practice to add use strict; to your scripts. Just saying...