Documentation not explain how to utilize GPU

Hi!
I am very new in ZCash and want to mine under linux.
zcash after run said:
"To enable mining, add 'gen=1' to your zcash.conf and restart."
Also here https://github.com/zcash/zcash/wiki/1.0-User-Guide#configuration is explained how to enable CPU mining,
but what about usual GPU mining? Is it on , how to turn on GPU mining?

Thank you!

You need a suitable miner. Use Claymore https://bitcointalk.org/index.php?topic=1670733.0 or Optiminer https://github.com/Optiminer/OptiminerZcash for AMD cards or EWBF for NVIDIA cards https://bitcointalk.org/index.php?topic=1707546.0