conditional compilation ?

If you try to# include your "user.h" file in more than one module, then you will be attempting to define multiple global variables of the same name, hence the error. If this is the case you may need to create a further condition in only one module. Perhaps something like:

# define MAIN_MODULE# include "user.h"# undef MAIN_MODULE

then in your user.h file, something like:

# ifdef MAIN_MODULE

const char adresse_mac_ethernet[6] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06} ;# else

extern const char adresse_mac_ethernet[];# endif

Good luck