I ran into this dependencies error on Ubuntu when I try to build the English Auction, does anyone have an idea how to solve it ?

Please switch to using either the new project style and the new-build command
or the legacy v1-build alias as new-style projects will become the default in
the next version of cabal-install. Please file a bug if you cannot replicate a
working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
Warning: solver failed to find a solution:
Could not resolve dependencies:
[__0] trying: plutus-pioneer-program-week01- (user goal)
[__1] next goal: base (dependency of plutus-pioneer-program-week01)
[__1] rejecting: base- (conflict:
plutus-pioneer-program-week01 => base^>=
[__1] fail (backjumping, conflict set: base, plutus-pioneer-program-week01)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: plutus-pioneer-program-week01, base
Trying configure anyway.
Configuring plutus-pioneer-program-week01-
cabal: Encountered missing dependencies:
aeson -any,
base >= && <4.15,
playground-common -any,
plutus-contract -any,
plutus-ledger -any,
plutus-tx -any,
plutus-tx-plugin -any
  • Please, include exact steps to reproduce this problem, from which repository, which branch, which version of operating system you are using. May 2, 2021 at 17:48

1 Answer 1


It looks like your cabal version is too old.

You can make sure you have the right one if you first start a nix-shell at the top-level directory of the plutus-repository, then cd to the code folder of the plutus-pioneer-program-repository and run cabal build from within that nix-shell.

  • awesome, thanks :)
    – kuldeep
    May 29, 2021 at 9:48

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.