> I can’t check right now, but I’m guessing a plain `cabal install` > would also add base64-bytestring to GHC’s visible packages?
I tested with cabal-install and it somehow manages to hide the haskell
packages that are installed as dependencies.
```
$ guix shell -CN cabal-install coreutils zlib -D ghc-old-time
## Building old-time failed so I added it's inputs.
## Zlib is also required for building the dependency chain.
$ cabal update
$ env -u GHC_PACKAGE_PATH cabal install --lib esqueleto
$ ghci
ﬦ import Database.Esqueleto.Experimental
-- This works, so the package from cabal-install is visible
ﬦ import Data.ByteString.Base64.URL.Lazy
<no location info>: error:
Could not load module `Data.ByteString.Base64.URL.Lazy'
It is a member of the hidden package `base64-bytestring-1.2.1.0'.
You can run `:set -package base64-bytestring' to expose it.
(Note: this unloads all the modules in the current scope.)
```
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