I've installed the latest version of X11 (XQuartz 2.5.3) and urxvt with Macports. I want urxvt to be transparent and borderless. My ~/.Xdefaults looks like this:
urxvt*foreground: #ffffff
urxvt*background: rgba:0000/0000/0000/4444
urxvt*transparent: true
urxvt*shading: 50
urxvt*depth: 32
urxvt*tint: white
urxvt*inheritPixmap: true
urxvt*borderless: true
urxvt*scrollbar: false
urxvt*scrollbar_right: false
But when I launch a urxvt terminal, the background is not transparent and the left scrollbar is present. Also, launching with the transparency example from the urxvt man page does not a transparent terminal make:
urxvt -depth 32 -bg rgba:0000/0000/0000/4444 -fg "[80]pink"
Any idea what I can do to get terminal transparency? I've found references to enabling "composition" in the xorg.conf file, but I can't find xorg.conf in OS X.