Portability between different compilers was a problem. People complain about C's portability, but at least you can rely on `fopen` existing. The best that Modul

Portability between different compilers was a problem. People complain about C's portability, but at least you can rely on `fopen` existing. The best that Modula-2 offered was a semi-standard InOut module that provided stdin/stdout functionality (no files). Eventually a real standard library was added by the ISO standard, but that was published about 10 years too late to have an impact.