/usr/include/diet/compiletimeassert.h is in libowfat-dietlibc-dev 0.30-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #define __X(x, y) x ## y
#define __Y(x, y) __X(x, y)
#define compiletimeassert(cond) struct __Y(foo,__LINE__) { char __temp[1 - (!(cond))*2]; };
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