Hi @rempas, thanks for your report. This error message means that you need to add -ldl to your commandline (symbol dlsym is missing). Depending on the options you used to build FLTK and your system configuration there may be even more required commandline flags. IIRC the requirement to add -ldl has been added later than the time when the docs were written but I believe all Linux builds need this nowadays. I'll add this to the docs. The recommended way to find the required flags is to use fltk-config as described in the same chapter.

That said, this is not the place to ask questions on how to build or use FLTK. If you have further questions, please follow the advice below. Thanks. Standard reply follows:

This is the wrong place to ask questions about building or running programs with FLTK (user support). FLTK "issues" are reserved for bug reports and requests for enhancements, for further information please visit https://www.fltk.org/bugs.php.

Please ask user questions in our user group fltk.general. Your question will have a wider audience and you will likely get more and quicker replies.

Please include the system/platform (Windows, Linux, macOS), the build system (Visual Studio, CMake, Ninja), compiler (gcc, clang), compiler version, and build error messages in text form (copy and paste preferred). TIA.

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