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main(int argc, char **argv, char **envp) {}

int main(int argc, char **argv, char **envp) {
   setenv("MY_NEW_VAR", "/usr/binnew_value", 1);

   if (envp != NULL) {
      for (i = 0; envp[i] != NULL; i++) {
         printf("%s\n", envp[i]); 
      }
   }

   return 0;
}

extern char **environ;

int main(int argc, char **argv) {
   setenv("MY_NEW_VAR", "/usr/binnew_value", 1);

   if (environ != NULL) { 
      for (i = 0; environ[i] != NULL; i++) {
         printf("%s\n", environ[i]); 
      }
   }

   return 0;
}