AFAIK, Cosmopolitan only works well if your program only depends on the libc. Even if you statically compile Dillo and the FLTK, you still would need a graphic

AFAIK, Cosmopolitan only works well if your program only depends on the libc. Even if you statically compile Dillo and the FLTK, you still would need a graphic Xorg server. For Linux and BSDs may work, but in macOS I think it won't, as for that platform you need the FLTK to link against macOS graphic libraries.