When I install cabal-helper with Stack, I get this error:

Couldn't find executable cabal-helper-wrapper in directory <project-directory>/.stack-work/install/x86_64-linux/lts-8.5/8.0.2/bin/

However, the binary is there, under .stack-work/install/x86_64-linux/lts-8.5/8.0.2/libexec/x86_64-linux-ghc-8.0.2/cabal-helper-0.7.3.0/cabal-helper-wrapper, so if I issue

cp .stack-work/install/x86_64-linux/lts-8.5/8.0.2/libexec/x86_64-linux-ghc-8.0.2/cabal-helper-0.7.3.0/cabal-helper-wrapper .stack-work/install/x86_64-linux/lts-8.5/8.0.2/bin/

and run stack install cabal-helper again, I get

Copying from <project-directory>/.stack-work/install/x86_64-linux/lts-8.5/8.0.2/bin/cabal-helper-wrapper to /home/ser/.local/bin/cabal-helper-wrapper

Copied executables to /home/ser/.local/bin/:
- cabal-helper-wrapper

I'm not sure whether this is an issue with Stack or cabal-helper, but cabal-helper is the only package I've seen that exhibits this behavior.

I execute all commands from the directory where https://github.com/input-output-hk/cardano-sl is cloned. Its latest .cabal file is here. My stack --version.

See also the mirror of this issue in the Stack repository.