“Good will” is something an actor earns over the course of a long and storied career. It’s what makes a movie star, and what makes movie stars “bankable.”

And it’s the currency such stars spend when what they give their audience isn’t the film they might have hoped it would be.

Alfre Woodard, Diane Keaton, Eugene Levy, Kathy Bates and Dennis Haysbert burn through some of their supply of good will on “Summer Camp,” an all-star comedy with AARP casting appeal and nothing else going for it.

We’ve loved Oscar winners Keaton and Bates, Oscar nominee Woodard, Emmy winner Levy and Golden Globe nominee Haysbert over decades of work. And as painful as this humorless-if-not-quite-heartless Castille Landon film is, we love them no less for signing on to do it.

OK, maybe a little less.

Perhaps writer-director Landon served Irish coffee at the pitch meetings. I don’t know. But this script is as dull as the direction is lifeless. She got her picture made with a winning “name” cast, but judging from the results, that’s the best you can say for her. The players deserved better.

Bates plays a “self-help guru” named Ginny Moon who apparently never got over being slightly older and wiser than the friends she made at Camp Pinnacle in Flat Rock, N.C., fifty years before.

Now she’s rounded up her two besties from those days, research scientist and entrepreneur Nora ( Keaton) and nurse, mother and grandmother Mary (Woodard), piled them into her book-and-lecture tour bus — Ginny’s books are the “Get Your S— Together” “boxed set” — and dragged them back to the place they all met.

The Camp Pinnacle reunion brings them and others their age back to N.C., where presumably they’ll all show how much they’ve matured, or how little they’ve changed.

“The Pretty Committee” of mean girls is still led by Jane (Beverly D.Angelo), with Judy and Evelyn (Maria Howell, Victoria Rowell) still in her posse.

“Whipsmart” camp hunk Stevie D. (Levy) still rolls with hunky Tommy (Haysbert), only now Stevie’s driving a 1960s Austin Healey and retired, and Tommy’s winding down a career as a globe-trotting surgeon.

Nothing and I mean NOTHING is done with the whole “mean girls” thing. The guys are here to present romantic possibilities for a couple of the ladies, and even that earns short shrift.

Bullying Ginny — who changed her name and got famous — micronamanages, criticizes and “fixes” one and all to such a degree that clothes-horse, widowed workaholic Nora and unhappily-married and put-upon Mary can’t make any headway with new flames.

The serious bits work better than the strained and depressing comical ones, and even they don’t entertain or enlighten. Woodard comes off the most “real,” her trademark. Levy is the least funny he’s ever been, thanks to a script his son should have taken a pass at. Describing someone as “still smells like patchoulie and lighter fluid” must be an improvised line, because it’s almost funny.

Bates grates and Keaton shows off her timeless beauty, fashion sense and favorite stunt doubles in a “camp” comedy where archery, river rafting, ziplining and pottery are played for “laughs.”

Nicole Richie is a camp counselor, blink and you’ll miss Arielle Kebbel. I did, but she’s in the closing credits. And Josh Peck is here as an ever-smiling hapless camp counselor who serves up most of the film’s pratfalls. Which aren’t funny.

The opening, featuring colorless voice-over narration by Bates, is tepid but competent. The finale is so abrupt that you’d think an irate studuio exec just shut off the lights. And nothing that comes between changes the sad “bad to worse” trajectory that “Summer Camp” was almost certainly fated to be.

Rating: PG-13, profanity, innuendo

Cast: Diane Keaton, Kathy Bates, Alfre Woodard, Eugene Levy, Dennis Haysbert and Beverly D’Angelo.

Credits: Scripted and directed by Castille Landon. A Roadside Attractions release.

Running time: 1:31