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Outdated systems used to provide the `<varargs.h>` and in case of PHP `<sys/varargs.h>`. [1] Current systems have `<stdarg.h>` which is also a C89 standard header and systems have it always present. [2] [1] https://en.wikipedia.org/wiki/Stdarg.h#varargs.h [2] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2