make auto complete? Programmable Completion?

Hi,
Lets say that I have a directory with the file:
testfile.c.

In the same directory I have a Makefile:
Code:CFLAGS=-Wall -g -W -pedantic -ansi -std=c99
CC=gccI call make with

>make te<tab>
but I get no auto completion.

If I add "testfile:" to the Makefile:
Code:CFLAGS=-Wall -g -W -pedantic -ansi -std=c99
CC=gcc
testfile:And I call make with:

>make te<tab>

it will generate

>make testfile

so auto complete works.

But how do I get it to work without "testfile:" in the Makefile?