Windows port (unistd.h)

[Vincent Caron]

Hello,

since there's no such <unistd.h> on my hostile planet :), I have to use 
the YY_NO_UNISTD_H feature. However I'm not sure where this macro should 
be defined in my case. My current solution is to add this blurb to the 
first section of scan.l :

#ifdef _WIN32
#define YY_NO_UNISTD_H
#endif

Not satisfying IMHO since users will have to copy this in every .l file 
to get a working scanner under Windows. What should I do ?