Century Embedded Technologies Nano-X SDK and Developer's Guide
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Header Files

The proper way to include FLTK header files is:

#include <FL/Fl_xyz.H>

Note: Microsoft Windows developers please note: case is significant under other operating systems, and the C standard uses the forward slash (/) to separate directories. Do not do any of the following: 

#include <FL\Fl_xyz.H>
#include <fl/fl_xyz.h>
#include <Fl/fl_xyz.h>
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