Probably some historical reasons. When like this, it works with current GCC
Patch from https://stackoverflow.com/questions/16378555/error-while-compiling-svga-source
Mostly test org mode rendering in forgejo
http://my.svgalib.org/svgalib/svgalib-1.9.25.tar.gz http://my.svgalib.org/svgalib/