Here's what the cabal wants:

  pkgconfig-depends:   libavutil, libavformat, libavcodec, libswscale, libavdevice,
                       libswresample

Here's what ffmpeg-full.dev has:

 /nix/store/7v77gvdjk8410qzrpkhymihgijf5s990-ffmpeg-full-7.1.1-dev/lib
└──  pkgconfig
    ├──  libavcodec.pc
    ├──  libavdevice.pc
    ├──  libavfilter.pc
    ├──  libavformat.pc
    ├──  libavutil.pc
    ├──  libpostproc.pc
    ├──  libswresample.pc
    └──  libswscale.pc

In reply to @sasha:the-apothecary.club
Heya, a while ago I wrote a program that uses the punycode package, which is marked as broken in nixpkgs. I'm trying to figure out why but have gotten nowhere, any suggestions?

In reply to @maralorn:maralorn.de
Have you looked for a "broken.yaml" file in nixpkgs and read the line in the corresponding comment?

Hey all! I'm routinely getting strange "missing dependencies" errors when trying to build with cabal on my NixOS machine. Never happens on non-NixOS. I must be missing something? E.g.:

Failed to build unix-2.8.6.0. The failure occurred during the configure step.
Build log (
/home/artem/.cache/cabal/logs/ghc-9.10.1/unix-2.8.6.0-7e70e93a018fa3cd3eeee6c9345819b76e60434f053c8d02acdb7ab743ba3a2a.log
):
Configuring unix-2.8.6.0...
Error: [Cabal-8010]
Encountered missing or private dependencies:
    tasty, tasty-hunit, tasty-quickcheck

happens to various dependencies when building various packages...

In reply to @artem.types:matrix.org

Hey all! I'm routinely getting strange "missing dependencies" errors when trying to build with cabal on my NixOS machine. Never happens on non-NixOS. I must be missing something? E.g.:

Failed to build unix-2.8.6.0. The failure occurred during the configure step.
Build log (
/home/artem/.cache/cabal/logs/ghc-9.10.1/unix-2.8.6.0-7e70e93a018fa3cd3eeee6c9345819b76e60434f053c8d02acdb7ab743ba3a2a.log
):
Configuring unix-2.8.6.0...
Error: [Cabal-8010]
Encountered missing or private dependencies:
    tasty, tasty-hunit, tasty-quickcheck

happens to various dependencies when building various packages...

Are you trying to override the unix package?

Boot libraries have special handling and cannot be overridden in the usual way.
For example:

nix-repl> haskellPackages.unix
null

In reply to @artem.types:matrix.org
@alex:tunstall.xyz: I'm building with cabal, not nix, so, I'm not sure I understand your question but no, I'm not doing anything special I just do `cabal build`

If you don't understand the question, the answer is "probably not".

Then you might have version constraints in your package that cause Cabal to reject the version installed with the GHC provided by Nix.
Can you try deleting the local copy of the package index? (I can't remember where in ~ cabal puts it.)

In reply to @maralorn:maralorn.de
@artem.types:matrix.org 1. Did you run cabal update? 2. Try reseting by removing dist-newstyle.

here's one way it fails for me (other version of GHC because it's another project that's easier to set up). I'm trying to build cabal from source, and I'm using very basic nix shell to get simple things like zlib into scope.

❯ git clone git@github.com:haskell/cabal
...
❯ git clone git@github.com:ulysses4ever/cabal.nix
...
❯ cd cabal
❯ nix develop ../cabal.nix
$ cabal build cabal
Build profile: -w ghc-9.6.6 -O1
In order, the following will be built (use -v for more details):
... long list...
Downloading  unix-2.8.7.0
Starting     base64-bytestring-1.2.1.0 (lib)
Starting     cryptohash-sha256-0.11.102.1 (lib)
Starting     regex-base-0.94.0.3 (lib)
Starting     os-string-2.0.7 (lib)
Starting     safe-exceptions-0.1.7.4 (lib)
Starting     th-compat-0.1.6 (lib)
Starting     splitmix-0.1.1 (lib)
Starting     atomic-counter-0.1.2.3 (lib)
Starting     base16-bytestring-1.0.2.0 (lib)
Starting     ed25519-0.0.5.0 (lib)
Downloaded   unix-2.8.7.0
Downloading  process-1.6.26.1
Starting     unix-2.8.7.0 (all, legacy fallback: build-type is Configure)
Downloaded   process-1.6.26.1
Downloading  semaphore-compat-1.0.0
Building     base64-bytestring-1.2.1.0 (lib)
Building     cryptohash-sha256-0.11.102.1 (lib)
Building     regex-base-0.94.0.3 (lib)
Building     os-string-2.0.7 (lib)
Building     safe-exceptions-0.1.7.4 (lib)
Building     splitmix-0.1.1 (lib)
Building     th-compat-0.1.6 (lib)
Downloaded   semaphore-compat-1.0.0
Building     base16-bytestring-1.0.2.0 (lib)
Building     atomic-counter-0.1.2.3 (lib)
Building     ed25519-0.0.5.0 (lib)
Installing   th-compat-0.1.6 (lib)
Installing   atomic-counter-0.1.2.3 (lib)
Installing   base16-bytestring-1.0.2.0 (lib)
Completed    th-compat-0.1.6 (lib)
Completed    base16-bytestring-1.0.2.0 (lib)
Installing   safe-exceptions-0.1.7.4 (lib)
Completed    atomic-counter-0.1.2.3 (lib)
Installing   base64-bytestring-1.2.1.0 (lib)
Installing   splitmix-0.1.1 (lib)
Completed    safe-exceptions-0.1.7.4 (lib)
Installing   regex-base-0.94.0.3 (lib)
Installing   cryptohash-sha256-0.11.102.1 (lib)
Completed    base64-bytestring-1.2.1.0 (lib)
Completed    splitmix-0.1.1 (lib)
Completed    regex-base-0.94.0.3 (lib)
Completed    cryptohash-sha256-0.11.102.1 (lib)
Installing   ed25519-0.0.5.0 (lib)
Completed    ed25519-0.0.5.0 (lib)
Installing   os-string-2.0.7 (lib)
Completed    os-string-2.0.7 (lib)

Failed to build unix-2.8.7.0. The failure occurred during the configure step.
Build log (
/home/artem/.cache/cabal/logs/ghc-9.6.6/unix-2.8.7.0-f12ffa080428729a9cad2c9d340f8a2e41259c127db9b0b6e0d00096ef0bef24.log
):
Configuring unix-2.8.7.0...
Error: [Cabal-8010]
Encountered missing or private dependencies:
    tasty, tasty-hunit, tasty-quickcheck

Error: [Cabal-7125]
Failed to build unix-2.8.7.0 (which is required by exe:cabal from cabal-install-3.15.0.0). See the build log above for details.

Build log isn't very useful:

❯ cat /home/artem/.cache/cabal/logs/ghc-9.6.6/unix-2.8.7.0-f12ffa080428729a9cad2c9d340f8a2e41259c127db9b0b6e0d00096ef0bef24.log

Configuring unix-2.8.7.0...
Error: [Cabal-8010]
Encountered missing or private dependencies:
    tasty, tasty-hunit, tasty-quickcheck