/usr/include/hplot/pilot.h is in libgraflib1-dev 20061220+dfsg3-2.
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 | #if (defined(CERNLIB_UNIX))||(!defined(CERNLIB_SINGLE))
#ifndef CERNLIB_DOUBLE
#define CERNLIB_DOUBLE
#endif
#endif
|