Yes, you can set it up quickly with Wineskin (Takes like ~10 minutes)
ggRO on Mac
Download Wineskin Winery: http://wineskin.urgesoftware.com/tiki-index.php?page=Downloads
Open Wineskin Winery -> Hit the + -> Install the latest Engine
Create New Blank Wrapper -> Name it [NAME]
Wine will request to install a few files -> Let it do so
After it is finished, click “View Wrapper in Finder”
Select your Wrapper named [NAME] -> Show Contents Package
Open Wineskin
Hit Install Software -> Select your ggRO.exe -> Let it install
Advanced -> Tools -> Winetricks (This will take a few minutes)
Select Games -> Check the Ragnarok Online box
Hit Run
Wineskin will request to install some more files -> Let it do so
Reopen Wrapper named [NAME]
After it is installed, hit Browse in your Wrapper and select the ggRO Patcher.exe (Default path is probably /Program Files/ggRO/ggRO Patcher.exe)
Hit Test Run and the patcher should pop up
Enjoy~