NEEDPUTENV
# define NEEDPUTENV 1 /* needs putenv (written in terms of setenv) */
# define NEEDPUTENV 1 /* need putenv(3) call */
# define NEEDPUTENV 1 /* need putenv(3) call */
# define NEEDPUTENV 2 /* need putenv(3) call; no setenv(3) call */
# undef NEEDPUTENV