Tracev
# define Tracev(x) {if (z_verbose>0) fprintf x ;}
# define Tracev(x)
# define Tracev(x) {if (verbose) fprintf x ;}
# define Tracev(x)
# define Tracev(x) {if (z_verbose>0) fprintf x ;}
# define Tracev(x)
# define Tracev(x) {if (z_verbose>0) fprintf x ;}
# define Tracev(x)