env_define
(void (*)())env_define, 2 },
ep = env_define((unsigned char *)*epp,
env_define((unsigned char *)"USER", ep->value);
env_define((unsigned char *)"USER", (unsigned char *)user);
struct env_lst *env_define (unsigned char *, unsigned char *);
env_define((unsigned char*)"DISPLAY", (unsigned char*)p);