Description of problem:

I just tried to compile package MagicPoint-1.11b-1 from 
Redhat Fedora Core 3 Test 3.

The compiler said

x11.c:365: warning: operation on `fullscreen' may be undefined

The source code is

        fullscreen = ++fullscreen % 2;

Upon inspection of the source code, it looks undefined code
to me as well. Suggest the following

        fullscreen = (fullscreen + 1) % 2;



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