AC_DEFUN([DX_FEATURE_ps], ON)
# Compatibility with older autoconf versions.
-m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AC_HELP_STRING]))])
+m4_ifdef([AS_HELP_STRING], , [m4_define([AS_HELP_STRING], m4_defn([AS_HELP_STRING]))])
## --------------- ##
## Private macros. ##