It is most likely a problem in either the Socketshr or Netlib libraries. This problem does not affect Perl executables built using the DEC C RTL sockets. No other times are reported incorrectly, and it's only for VMS 7.1. There is a patch for this one. Needs a patch to vms.c.
Instructions are on the InstallFAQ page.
Modules with uppercase letters in sub names won't build properly.