/usr/include/wibble/sys/macros.h is in libwibble-dev 1.1-1.
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 8 9 10 11 | #if !defined(POSIX) && !defined(_WIN32)
#ifdef WIN32
#define _WIN32
#endif
#ifdef __unix__
#define POSIX
#endif
#ifdef __xlC__
#define POSIX
#endif
#endif
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