For the source package:
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First you need to check if FLTK is already installed on your PC.
You can do this by executing the command:
fltk-config --version
If the command is not found, FLTK is NOT installed on your PC.

butt was tested with FLTK v1.1.x

You can get it on http://www.fltk.org
If you like eyecandy you should configure fltk with
./configure --with-xft


For the binary package:
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Just run ./install.sh as root
