Update to 2.12. From the changelog:

[SECURITY FIXES]
This version of ack prevents the --pager, --regex and --output
options from being used from project-level ackrc files. It is
possible to execute malicious code with these options, and we want
to prevent the security risk of acking through a potentially malicious
codebase, such as one downloaded from an Internet site or checked
out from a code repository.

The --pager, --regex and --output options may still be used from
the global /etc/ackrc, your own private ~/.ackrc, the ACK_OPTIONS
environment variable, and of course from the command line.

[ENHANCEMENTS]
Now ignores Eclipse .metadata directory. Thanks, Steffen Jaeckel.

Add --perltest for *.t files.

Added Matlab support. Thanks, Zertrin.

[FIXES]
Fixed a race condition in t/file-permission.t that was causing
failures if tests were run in parallel.

Fix the test suite for Win32. Many thanks to Christian Walde for
bringing the severity of this issue to our attention, as well as
providing a Win32 development environment for us to work with.

Fixed Win32-detection in the Makefile.PL. Thanks, Michael Beijen
and Alexandr Ciornii.

More compatibility fixes for Perl 5.8.8.

[INTERNALS]
Removed the Git revision tracking in the --version.


(schmonz)