/usr/lib/gcc/x86_64-linux-gnu/7/include/varargs.h is in libgcc-7-dev 7.3.0-16ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #ifndef _VARARGS_H
#define _VARARGS_H
#error "GCC no longer implements <varargs.h>."
#error "Revise your code to use <stdarg.h>."
#endif
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