[CMake] Using fluid, fltk, cmake and own headers

[Atwood, Robert C]

> You can add the following to your toplevel CMakeLists.txt:
> SET(CMAKE_INCLUDE_CURRENT_DIR TRUE)

Yes, that's just what I want ! Thannks

> make.org/Wiki/CMake_Useful_Variables#Various_Options

That site's a bit scary, I'll stick with cmake.org for now!
;-/