[Xquartz-dev] Enabling 120dpi with Xquartz?

Does anyone know how to adjust DPI on MacOS? I'm using X11 from MacPorts and I'm unable to increase DPI as follows: $ xrandr --output default --dpi 120 --gamma 1:1:1 xrandr: Gamma size is 0. $ xdpyinfo|grep resolution resolution: 96x96 dots per inch