d1ea57bc7a
- don't use pkg-config to find Cairo if FLTK_CAIRO_DIR is set - use FLTK_CAIRO_DIR to locate Cairo headers and DLL if it is set - otherwise try to find Cairo with pkg-config anyway This prevents accidentally "finding" the system Cairo libs provided by MSYS - which would tie the FLTK library and user programs to MSYS, i.e. it would make FLTK programs depend on the MSYS installation.
README - Fast Light Tool Kit (FLTK) Version 1.4.0
WHAT IS FLTK?
The Fast Light Tool Kit 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
