Trying to build garnet, I get an error when I try to open the display:
Unhandled SIMPLE-ERROR in thread #<SB-THREAD:THREAD "main thread" RUNNING {1003AAE743}>: Could not open a display for "/private/tmp/com.apple.launchd.EauNyeZmg1/org.macosforge.xquartz:0".
I have investigated further. This seems to be a bug in the CLX I'm using with SBCL. I use the sharplispers/clx from github. Doesn't seem to work with Xquartz. Not a garnet problem.