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Derivation is missing output

From: Hartmut Goebel
Subject: Derivation is missing output
Date: Mon, 22 Jun 2020 16:07:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0


I'm still working on the download and importer for and the rebar3
build-system for Erlang. So far I made good progress, but now I stepped
over a curious issue:

The downloader is modeled like the one for git, bzr and hg, creating a
fixed script controlled by environment variables. The script is created
as expected. But the script is never run. After some debugging, I
discovered that the source package's .drv file does not define any output:


What can be the reason for this?

Some background (the whole source can be found at

       (method hexpm-fetch)
       (uri "";)
        (base32 "1fhqnn4dvcil12cmqmzkmlk14lq5rn7ingld2380i6nl8v2dvm48"))))

and hexpm-fetch returns

  (mlet %store-monad ((guile (package->derivation guile system)))
    (gexp->derivation (pk (or name file-name)) build
                       … more arguments))

Hartmut Goebel

| Hartmut Goebel          |               |
| | compilers which you thought are impossible |

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