+++ This bug was initially created as a clone of Bug #2214397 +++

The perl script were made to use strict; but the callgrind_control script is not correct perl strict. Causing:

$ callgrind_control --help
Global symbol "@pids" requires explicit package name (did you forget to declare "my @pids"?) at /usr/bin/callgrind_control line 35.
Global symbol "$vgdbPrefixOption" requires explicit package name (did you forget to declare "my $vgdbPrefixOption"?) at /usr/bin/callgrind_control line 36.
Global symbol "$pid" requires explicit package name (did you forget to declare "my $pid"?) at /usr/bin/callgrind_control line 39.
[...]

Upstream fixed this by rewriting the script. I like to simply remove the use strict; line to get back to the known working version. Already done in Fedora.