摘要: 先贴一段fltk的官网介绍：
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是一套适用于unix/linux、windows和macos的跨平台c++界面库，尺寸精简，具有现代GUI功能，支持OpenGL，内置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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