How to install a package using stack?

by 
stack install hakyll

stack offers a curated set of packages that won’t blow your machine up. If you want to check what packages are available, or exactly what version is supported, or on what version of GHC you can get it, check out https://www.stackage.org/.

For example, you can get hakyll 4.6.9.0 right now for both GHC 7.8.4 and GHC 7.10.1. Pretty neat. – source

EDIT: I forgot to mention, Yuan Wang’s method works for getting the version of hakyll that is not curated into stackage. It’s up to you what version you need.

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