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Comparing ray/src/common/standard.h (file contents):
Revision 2.6 by greg, Fri Nov 10 17:04:14 1995 UTC vs.
Revision 2.7 by greg, Wed Jan 10 09:10:58 1996 UTC

# Line 26 | Line 26 | typedef struct {
26          XF  b;                                  /* backward */
27   }  FULLXF;
28  
29 + #ifndef  PI
30   #ifdef  M_PI
31   #define  PI             M_PI
32   #else
33   #define  PI             3.14159265358979323846
34 + #endif
35   #endif
36  
37   #ifndef  F_OK                   /* mode bits for access(2) call */

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