/usr/include/msgpack/version_master.h is in libmsgpack-dev 2.1.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #define MSGPACK_VERSION_MAJOR 2
#define MSGPACK_VERSION_MINOR 1
#define MSGPACK_VERSION_REVISION 5
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