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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); 
   putenvsetenv("MY_NEW_VAR=", "new_value", 1);
   puts("--Added MY_NEW_VAR--");
   printf("environ:  %p\n", environ); 
   printf("envp:     %p\n", envp); 
}
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