> I'm trying to build fltk on a windows machine with msys2 and mingw64.
> When I run ./configure, it stops on error : cannot find requested X11 libs.

> I used pacman to install mingw-...-tk tools which install what I supposed the configure needed, but it still fails.

> What is missing and how can I install it ?

What version of fltk are you using? (And, I suppose, where did you obtain it?)

What version of mingw64 are you using? 
Fltk for Windows will target the native Windows API, so should NOT be referencing X11 at all - but there are *some* versions of mingw64 that are "Cygwin-like" and will call in X11, so you may conceivably have the "wrong" mingw! 
Do you have the w32 API files installed correctly for your compiler to use?
Does it work for other compilation tasks correctly?

The relevant readme file in fltk-1.4 is README.Windows.txt; have you read through that? Did it help?
(I think that was README.MSWindows.txt in fltk-1.3, but I suspect that is somewhat dated now..!)

With a working mingw64 installation, in an Msys2 shell, the "./configure" should Just Work when building fltk, so there may be something wrong with your build environment.





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