Not at all. Tiny textmode programs do not generally require specific hardware or OS versions. Windows/Mac/Linux should cover the large majority of users. Or you

Not at all. Tiny textmode programs do not generally require specific hardware or OS versions. Windows/Mac/Linux should cover the large majority of users. Or you could just do Windows, since Unix machines (including Macs) most likely have gcc installed already. Or you could skip all that and include a Repl.it link, like Yorwba thoughtfully provided in the sibling comment. If it did require specific hardware or software, that would be different, which is why I specifically said "simple, standalone code."