Welcome Tonma, I assume you're on Linux and you installed from the stable release, instead of from git? If so please try the installer script in my forum signature. I think you're experiencing an old bug where -lgl should be -lGL but nobody noticed due to Windows and Mac osx having case-insensitive...

Hi, I'm a new french developer on Dreamcast. I did some tests like display an image or move sprites. But I have a problem. I installed a fresh new version on my computer with the git on git://git.code.sf.net/p/cadcdev/kallistios I can run examples, everything works except kgl demo. It doesn't compil...