PR_IMPLEMENT(char*) PR_GetEnv(const char *var)
PR_IMPLEMENT(PRIntn) PR_PutEnv(const char *string)
PR_IMPLEMENT(char*) PR_GetEnv(const char *var){    char *ev;    if (!_pr_initialized) _PR_ImplicitInitialization();    _PR_LOCK_ENV();    ev = _PR_MD_GET_ENV(var);    _PR_UNLOCK_ENV();    return ev;}