You should create file `` with the following contents:
{
"config" : [ "/home/<username>/.local/share/Steam/config/" ],
"external_drivers" : null,
"log" : [ "/home/<username>/.local/share/Steam/logs/" ],
"runtime" : [ "/home/<username>/.local/share/Steam/SteamApps/common/SteamVR" ]
}
where <username>
is user name of the Unix user which uses Steam client.