For those who already tried to run Dia on their MacBook, iMac, etc.
You should have notice that Dia simply doesn’t work, at least that’s what I saw when I’ve tried to use it 😉
Please find below a quick fix to run it
Quick solution
Simply run Dia using the terminal as below
DISPLAY=:0 /Applications/Dia.app/Contents/Resources/bin/dia
Enjoy !
Inspired by http://navkirats.blogspot.ch/2014/10/dia-diagram-mac-osx-yosemite-fix-i-use.html