Please describe the problem.

Module System.PosixCompat.User has been removed in unix-compat-0.7 (see changelog). As a result, git-annex failed to build, with the following error:

Starting     git-annex-10.20230329 (all, legacy fallback)
Error: cabal: Failed to build git-annex-10.20230329. The failure occurred
during the configure step. The exception was:
/private/tmp/git-annex-20230329-55610-12n1hf4/git-annex-10.20230329/.brew_home/.cabal/logs/ghc-9.4.4/gt-nnx-10.20230329-579147b2.log:
withFile: user error (Error: cabal: '/opt/homebrew/opt/ghc/bin/ghc' exited
with an error:

/private/tmp/cabal-install.-55709/dist-newstyle/tmp/src-55709/git-annex-10.20230329/Utility/UserInfo.hs:24:1:
error:
Could not find module ‘System.PosixCompat.User’
Perhaps you meant
System.PosixCompat.Temp (from unix-compat-0.7)
System.PosixCompat.Time (from unix-compat-0.7)
System.PosixCompat.Files (from unix-compat-0.7)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
|
24 | import System.PosixCompat.User
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)

What steps will reproduce the problem?

cabal v2-update
cabal v2-install --jobs=8 --max-backjumps=100000 --install-method=copy --installdir=/opt/homebrew/Cellar/git-annex/10.20230329/bin --flags=+S3

(Note: I omitted some workarounds used to build with GHC >= 9.2. The full package description for building git-annex can be found here.)

What version of git-annex are you using? On what operating system?

git-annex: 10.20230329 (But it failed with 10.20230321, too.)

OS: macOS 11, 12, 13 (x86_64 and arm64), Ubuntu 22.04 (x86_64)

Please provide any additional information below.

The error was observed while packaging git-annex for Homebrew here. Currently, that's being worked around by restricting unix-compat version to >= 0.5 && < 0.7 in git-annex.cabal.

Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

Sorry, I'm not a git-annex user. I'm a maintainer of the Homebrew package manager, and I help to make the newest git-annex available to our users.

Thanks for all your work maintaining git-annex!

fixed by avoiding the broken version --Joey