[University] A Bouncing Ball

[sporronthewild at hushmail.com]

Hi Quentin.  I'm trying to run your Bouncing Ball program but gnatmake
won't recognise 'Display'. 
My system is Linuxmint with Ada 2012 and gnat 4.8, gcc 4.4.
I can't find any mention of the Display library in my file system or
online.
Your advice would be most helpful.
Yours Ron Gerhardt

_Talent is a common thing; what is rare is the courage to use it._
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