/usr/lib/grass64/include/grass/version.h is in grass-dev 6.4.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | #define GRASS_VERSION_STRING "@(#) 6.4.3 (2013)"
#define GRASS_VERSION_MAJOR 6
#define GRASS_VERSION_MINOR 4
#define GRASS_VERSION_RELEASE 3
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