1. In a large pot of boiling salted water, cook pasta according to package instructions; drain well.
2. Melt butter in a large saucepan over medium high heat. Add garlic and red pepper flakes, and cook, stirring frequently, until fragrant, about 1 minute. Stir in vegetable broth; season with salt and pepper, to taste.
3. Bring to a boil; reduce heat and simmer until reduced by half, about 1-2 minutes. Stir in clams. Cover, with a tight-fitting lid, and cook until the clams have opened, about 5-8 minutes. Discard any unopened clams.
4. Stir in pasta and additional vegetable broth, as needed.
5. Serve immediately, garnished with parsley, if desired.

Recipe courtesy of Damn Delicious
https://damndelicious.net/2014/12/20/easy-linguine...