/usr/include/atlas/atlas_cNCmm.h is in libatlas-dev 3.10.1-4.
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 12 13 14 15 16 17 18 19 20 21 22 23  | #ifndef CMM_H
   #define CMM_H
   #define ATL_mmNOMULADD
   #define ATL_mmLAT 3
   #define ATL_mmMU  6
   #define ATL_mmNU  1
   #define ATL_mmKU  60
   #define MB 60
   #define NB 60
   #define KB 60
   #define NBNB 3600
   #define MBNB 3600
   #define MBKB 3600
   #define NBKB 3600
   #define NB2 120
   #define NBNB2 7200
   #define ATL_MulByNB(N_) ((N_) * 60)
   #define ATL_DivByNB(N_) ((N_) / 60)
   #define ATL_MulByNBNB(N_) ((N_) * 3600)
#endif
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