How to access debian gpio, not as root?

Hello everyone,
I’m testing last release of Debian (2014-04-14) to use with my custom board.
I’ve just written my cape overlay and tested it.
my problem is that I can manage any gpio under /sys/class/gpio only if I’m logged-in as root, but not as “debian” user i.e., than from my Qt application, i can’t manage gpio.

I’ve found some suggestion (run program as root, add a udev rules, …) but I want your suggestion for the right way to do that.

In reality I haven’t found right instruction for udev solution, just seen that:

thank you for your time!

Have you created a file on /etc/udev/rules.d with the two lines of code from your link? that should work