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Need sudo right in RosLaunch

Hello, I try to launch a node which contain a pigpio library command (init, read, write, handler ...) But roslaunch resend me :

±----------------------------------------------------------------------------+

|Sorry, you don’t have permission to run this program. |

|Try running as root, e.g. precede the command with sudo. |

±----------------------------------------------------------------------------+

It's pigpio access who need sudo right to initialise and so on. Have you an idea, how to get around that need ??

Thx, Thierry