AC_DEFUN([adl_ENABLE_DEVEL],
[AC_ARG_ENABLE([devel],
	       [AC_HELP_STRING([--enable-devel],
			       [turn on useful developer options])])

 # Turn on devel options for development version, unless
 # explicitely turned off.
 if test -z "$enable_devel"; then
   case $VERSION in
     *[abcdefghijklmnopqrstuvwxyz])
       enable_devel=yes ;;
   esac
 fi

 if test x"$enable_devel" = xyes; then
   enable_debug=${enable_debug-yes}
   enable_warnings=${enable_warnings-yes}
   enable_assert=${enable_assert-yes}
   enable_optimizations=${enable_optimizations--O}
 fi
])