摘要: 先貼一段fltk的官網介紹：
FLTK (pronounced "fulltick") is a cross-platform C++ GUI toolkit for UNIX?/Linux? (X11), Microsoft? Windows?, and MacOS? X. FLTK provides modern GUI functionality without the bloat and supports 3D graphics via OpenGL? and its built-in GLUT emulation.
FLTK是一套適用于unix/linux、windows和macos的跨平臺c++界面庫，尺寸精簡，具有現代GUI功能，支持OpenGL，內置glut
FLTK is designed to be small and modular enough to be statically linked, but works fine as a shared library. FLTK also includes an
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