Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below.
+ AC_HELP_STRING([--with-pmip-use-radius],[use radius auth]), + [ac_cv_pmip_use_radius=$withval], [ac_cv_pmip_use_radius=no]) +if test x$ac_cv_pmip_use_radius = xyes ...