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extern char **environ;

/* ... */

int main(int argc, char *argv[], char *envp[]) {
   printf("environ:  %p\n", environ);
   printf("envp:     %p\n", envp);
   setenv("MY_NEW_VAR", "new_value", 1);
   puts("--Added MY_NEW_VAR--");
   printf("environ:  %p\n", environ);
   printf("envp:     %p\n", envp);
}

extern char **environ;

/* ... */

int main(int argc, char *argv[]) {
   setenv("MY_NEW_VAR", "new_value", 1);
   if (environ != NULL) {
      for (size_t i = 0; environ[i] != NULL; i++) {
         puts(environ[i]);
      }
   }
   return 0;
}

extern char **environ;
#define envp environ

/* ... */
main(int argc, char *argv[])