@diplodocuslongus Hi Ludo, thanks for testing and reporting your results here. The general answer to this issue is that I intend to add another chapter to the docs describing the correct way to build FLTK itself and to build programs with FLTK. I hope I can find the time soon after the release of 1.3.6.

Regarding some of your points:

• using the instructions in the README_Unix.txt

These instructions are really outdated. With the latest version 1.4 (Git master) an easier way is:

autoconf
./configure

• using the approach mentioned above by @Albrecht-S (me)

The idea here it NOT to run a full make in the first step which would build the entire FLTK library and test programs unless you interrupt it with ^C. Using make clean as the first command skips the build step and is much faster, so you would use:

make clean
./configure <options> ...
make

• using cmake

Instructions are so far correct. There's indeed no .configure but there are several CMake options you can set via the commandline or edit in the cache.

• Worth noting, there's also the approach to download a tar.gz archive ... (URL elided)

Where did you get that URL from? The correct URL is: https://www.fltk.org/software.php?VERSION=1.3.5 where VERSION=... may be omitted or replaced with the requested version. You still need to select the correct file(s) and trigger the download manually. Note that you can also click the Download link on the main FLTK page.

• Not mentioned before: you can also download a Zip archive from GitHub for any version (branch, commit) you like. This archive contains the same files as a Git download, hence you need to run autoconf as in points one and two above.

There's much more to say about it (configure and/or CMake options, different CMake generators etc.) which is why I'm planning to add a full chapter to the documentation rather than having lots of README files with unavoidable overlap. For instance README.CMake.txt naturally has to cover all available build platforms and README.Unix.txt also applies to builds under Windows with Cygwin or MinGW (MSYS).

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