Stack build fails due to missing package although stack ghci works

Question

I am trying to build a simple program in Haskell using stack. I created a new project using stack new and did a stack setup after that. The templat

Answer 1

This is likely because you added bytestring to the build-depends of the library, not the executable. One option to avoid needing to repeat these dependencies for the different stanzas is to use hpack as the package description format.