-AC_ARG_VAR([FLEX], [Command to invoke flex. Defaults to flex.])
-AC_ARG_VAR([FLEXFLAGS], [Additional options to pass to flex.])
-AC_CHECK_PROGS([FLEX], [flex], [flex])
-
-AC_ARG_VAR([BISON], [Command to invoke GNU Bison. Defaults to bison.])
-AC_ARG_VAR([BISONFLAGS], [Additional options to pass to Bison.])
-AC_CHECK_PROGS([BISON], [bison], [bison])
+DX_PROG_FLEX([], [], [FLEX=false])
+DX_PROG_BISON([], [], [BISON=false])
+DX_BISON_COMPAT