ac_echo_n

AC_ECHO_N(PATH) this is somewhat like the macro _AC_ECHO_N from autoconf 2.4x defined here for use in autoconf 2.1x, add the _ when you use 2.4x

# _AC_ECHO_N(STRING, [FD = AS_MESSAGE_FD])
# ------------------------------------
# Same as _AS_ECHO, but echo doesn't return to a new line.
AC_DEFUN([AC_ECHO_N],[dnl
[echo $ac_n "$1""$ac_c" >&AC_FD_MSG])