dnl CF_MAWK_SET_IF_UNSET version: 1 updated: 2008/09/09 19:18:22
dnl --------------------
dnl Set a variable if it is not set by configure script.
AC_DEFUN([CF_MAWK_SET_IF_UNSET],
[test "[$]{$1+set}" = set || $1="$2"
AC_SUBST($1)])dnl
