
Although CMake uses previously undefined variables like empty strings it could happen that variables set in the calling context by other projects initialized some variables with unexpected values. Example: FLTK_LIBRARIES could have been initialized by previous execution of 'find_package(FLTK ...)' in a project using FLTK
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README - Fast Light Tool Kit (FLTK) Version 1.4.0
WHAT IS FLTK?
The Fast Light Tool Kit ("FLTK", pronounced "fulltick") is a
cross-platform C++ GUI toolkit for UNIX®/Linux® (X11 or
Wayland), Microsoft® Windows®, and macOS®.
FLTK provides modern GUI functionality without the bloat and
supports 3D graphics via OpenGL® and its built-in GLUT
emulation. It was originally developed by Mr. Bill Spitzak
and is currently maintained by a small group of developers
across the world with a central repository on GitHub.
For more information see README.txt:
https://github.com/fltk/fltk/blob/master/README.txt
Description
Languages
C++
50.9%
C
42.7%
Objective-C++
1.9%
Roff
1.8%
CMake
1.3%
Other
1.4%