/usr/include/NTL/gmp_aux.h is in libntl-dev 5.4.2-4.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | #define NTL_ZZ_NBITS (64)
#define NTL_ZZ_FRADIX (((double)(1L<<62))*((double)(1L<<2)))
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