Cask mono-libgdiplus has a dependency on icu4c@77 which should up upgraded to icu4c@78 - this causes some brew doctor weirdness #6814

karianna · 2026-04-24T08:07:59Z

karianna
Apr 24, 2026

Output of `brew config`

HOMEBREW_VERSION: 5.1.7
ORIGIN: https://github.com/Homebrew/brew
HEAD: 3aae056b8d072624255bc8fd27febb7f327b2265
Last commit: 6 days ago
Branch: stable
Core tap JSON: 24 Apr 07:53 UTC
Core cask tap JSON: 24 Apr 07:53 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DOWNLOAD_CONCURRENCY: 32
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 16
Homebrew Ruby: 4.0.2 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/4.0.2_1/bin/ruby
CPU: 16-core 64-bit arm_palma
Clang: 21.0.0 build 2100
Git: 2.54.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 26.4.1-arm64
CLT: 26.4.1.0.1775747724
Xcode: 26.4.1
Metal Toolchain: N/A
Rosetta 2: false

Output of `brew doctor`

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  icu4c@77

Warning: Some installed formulae are missing dependencies.
You should `brew install` the missing dependencies:
  brew install icu4c@78

Description of issue

This is causing a little confusion with brew doctor

brew uninstall icu4c@77
Error: Refusing to uninstall /opt/homebrew/Cellar/icu4c@77/77.1_1
because it is required by mono-libgdiplus, which is currently installed.
You can override this and force removal with:
brew uninstall --ignore-dependencies icu4c@77

Interestingly brew doctor gives misleading information:

brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  icu4c@77

Warning: Some installed formulae are missing dependencies.
You should `brew install` the missing dependencies:
  brew install icu4c@78

brew list icu4c
/opt/homebrew/Cellar/icu4c@78/78.3/bin/derb
/opt/homebrew/Cellar/icu4c@78/78.3/bin/genbrk
/opt/homebrew/Cellar/icu4c@78/78.3/bin/gencfu
/opt/homebrew/Cellar/icu4c@78/78.3/bin/gencnval
/opt/homebrew/Cellar/icu4c@78/78.3/bin/gendict
/opt/homebrew/Cellar/icu4c@78/78.3/bin/genrb
/opt/homebrew/Cellar/icu4c@78/78.3/bin/icu-config
/opt/homebrew/Cellar/icu4c@78/78.3/bin/icuexportdata
/opt/homebrew/Cellar/icu4c@78/78.3/bin/icuinfo
/opt/homebrew/Cellar/icu4c@78/78.3/bin/makeconv
/opt/homebrew/Cellar/icu4c@78/78.3/bin/pkgdata
/opt/homebrew/Cellar/icu4c@78/78.3/bin/uconv
/opt/homebrew/Cellar/icu4c@78/78.3/include/unicode/ (205 files)
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicudata.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicui18n.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicuio.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicutest.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicutu.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/libicuuc.78.3.dylib
/opt/homebrew/Cellar/icu4c@78/78.3/lib/icu/ (4 files)
/opt/homebrew/Cellar/icu4c@78/78.3/lib/pkgconfig/ (3 files)
/opt/homebrew/Cellar/icu4c@78/78.3/lib/ (18 other files)
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/escapesrc
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/genccode
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/gencmn
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/gennorm2
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/gensprep
/opt/homebrew/Cellar/icu4c@78/78.3/sbin/icupkg
/opt/homebrew/Cellar/icu4c@78/78.3/sbom.spdx.json
/opt/homebrew/Cellar/icu4c@78/78.3/share/icu/ (4 files)
/opt/homebrew/Cellar/icu4c@78/78.3/share/man/ (15 files)

Relevant casks

mono-libgdiplus

Answered by Cueball

Apr 25, 2026

TLDR - Fix the warning with this command:

brew uninstall --ignore-dependencies icu4c@77 && brew missing | cut -d':' -f1 | xargs -n1 brew reinstall

I had the same brew dr warning about icu4c@77. Hadn't bothered to look into it until now; thought it might be a transient issue, and nothing seemed to be broken, so IDK 🤷

Did have different dependencies: antlr, ditaa, git-mob, gitmoji, openslide, and timg.
Every one of these formulae were considered up-to-date
- Ran brew deps --tree on each
- Each showed only a dependency on icu4c@78 (which was also already installed)

After running brew uninstall --ignore-dependencies icu4c@77 && brew dr, the warning changed:

Warning: Some installed formulae…

View full answer

daeho-ro · 2026-04-24T09:38:22Z

daeho-ro
Apr 24, 2026
Collaborator Sponsor

I don't see any dependency of icu4c@77 from mono-libgdiplus, what version of mono-libgdiplus are you using?

https://github.com/Homebrew/homebrew-core/blob/b49a94b4d7cf48069ce77e60e3f4b19c177a1c01/Formula/m/mono-libgdiplus.rb

Can you test it again after upgrade mono-libgdiplus?

4 replies

karianna Apr 25, 2026
Author

brew info mono-libgdiplus
==> mono-libgdiplus ✔: stable 6.2 (bottled)
GDI+-compatible API on non-Windows operating systems
https://www.mono-project.com/docs/gui/libgdiplus/
Installed (on request)
/opt/homebrew/Cellar/mono-libgdiplus/6.2 (14 files, 1.2MB) *
Poured from bottle using the formulae.brew.sh API on 2025-03-23 at 13:17:49
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/m/mono-libgdiplus.rb
License: MIT
==> Dependencies
Required (12): cairo ✔, fontconfig ✔, giflib ✔, glib ✔, harfbuzz ✔, jpeg-turbo ✔, libexif ✔, libpng ✔, libtiff ✔, pango ✔, freetype ✔, gettext ✔
Recursive Runtime (29): 29 ✔, 0 ✘
==> Analytics
install: 1,545 (30 days), 4,071 (90 days), 12,191 (365 days)
install-on-request: 1,441 (30 days), 3,829 (90 days), 11,889 (365 days)
build-error: 0 (30 days)

karianna Apr 25, 2026
Author

Interesting that there's no direct icu4c dependency there but when I go:

brew uninstall icu4c@77
Error: Refusing to uninstall /opt/homebrew/Cellar/icu4c@77/77.1_1
because it is required by mono-libgdiplus, which is currently installed.
You can override this and force removal with:
brew uninstall --ignore-dependencies icu4c@77

I'm hesitant to do this of course :-)

daeho-ro Apr 25, 2026
Collaborator Sponsor

You could remove it by

brew uninstall --ignore-dependencies icu4c@77

and if somethings wrong, it is possible to install it again. BTW, v78 is installed?

bevanjkay Apr 25, 2026
Collaborator

Or you could try the output of brew deps --tree mono-libgdiplus and search the output to see where icu4c@77 comes from.

Cueball · 2026-04-25T19:53:13Z

Cueball
Apr 25, 2026

TLDR - Fix the warning with this command:

brew uninstall --ignore-dependencies icu4c@77 && brew missing | cut -d':' -f1 | xargs -n1 brew reinstall

I had the same brew dr warning about icu4c@77. Hadn't bothered to look into it until now; thought it might be a transient issue, and nothing seemed to be broken, so IDK 🤷

Did have different dependencies: antlr, ditaa, git-mob, gitmoji, openslide, and timg.
Every one of these formulae were considered up-to-date
- Ran brew deps --tree on each
- Each showed only a dependency on icu4c@78 (which was also already installed)

After running brew uninstall --ignore-dependencies icu4c@77 && brew dr, the warning changed:

Warning: Some installed formulae are missing dependencies.
You should `brew install` the missing dependencies:
  brew install icu4c@77

Run `brew missing` for more details.

Then brew missing gave:

antlr: icu4c@77
ditaa: icu4c@77
git-mob: icu4c@77
gitmoji: icu4c@77
openslide: icu4c@77
timg: icu4c@77

IDK why the installed versions reported the missing dependency on icu4c@77, as they were supposedly up-to-date and the current formula only shows icu4c@78 as a dependency.

For me, logical next step was to reinstall each of these dependent formulae: brew missing | cut -d':' -f1 | xargs -n1 brew reinstall && brew dr

Warning is now gone. ✅

Obviously having the warning about icu4c@77 isn't ideal, but it's not a dealbreaker IMHO.

3 replies

karianna Apr 26, 2026
Author

This resolved it for me, thank you!

gromgit Apr 27, 2026

Ran brew deps --tree on each

Each showed only a dependency on icu4c@78 (which was also already installed)

Sounds like you ran into this gotcha from the brew deps docs:-

If any version of each formula argument is installed and no other options are passed, this command displays their actual runtime dependencies (similar to brew linkage), which may differ from a formula's declared dependencies.

Since you did pass the --tree option, brew deps pulled dependency info from the API (or local formula file, if you set HOMEBREW_NO_INSTALL_FROM_API) instead of the actual installation.

Cueball Apr 27, 2026

FWIW I'll concede I didn't look at the docs for brew deps and blithely 🙃 used the commands that @bevanjkay indicated might help (thankyou for that tip!)

I don't often need to use deps with brew. I would have re-checked docs for the command if I'd encountered any major issues here; but the process I described above took about 10 minutes to resolve, so IMHO reading docs wasn't called for at the time.

But @gromgit - I appreciate the heads-up about the docs and caveats on deps 🙌. It's good to know that there are ~~gotchas~~ edge cases 😁 I should be more aware of, especially when the docs are Pretty Damn Good™ and helpful. Legit, the docs and man pages aren't perfect, but IMO they're really solid examples of what "good" docs for CLI tools should look like.

I don't have HOMEBREW_NO_INSTALL_FROM_API set, and from a cursory inspection of brew deps —help I suspect I would have tried brew deps --tree --missing first, and explored other options if that was insufficiently enlightening.

Having resolved the issue now I can't investigate the multiple potential options to deps that might have elucidated the issue more fully. But problem is solved and now I've learned something new - all that counts as a win 🏆 in my book…

[FTR not seeking additional comments, but am simply adding this comment in the hope this discussion might be of assistance to others in future…even if the "others" is just me 18 months from now haha 😂 ]

Homebrew

Cask mono-libgdiplus has a dependency on icu4c@77 which should up upgraded to icu4c@78 - this causes some brew doctor weirdness #6814

Uh oh!

karianna Apr 24, 2026

Output of brew config

Output of brew doctor

Description of issue

Relevant casks

Replies: 2 comments · 7 replies

Uh oh!

Uh oh!

daeho-ro Apr 24, 2026 Collaborator Sponsor

Uh oh!

karianna Apr 25, 2026 Author

Uh oh!

karianna Apr 25, 2026 Author

Uh oh!

daeho-ro Apr 25, 2026 Collaborator Sponsor

Uh oh!

bevanjkay Apr 25, 2026 Collaborator

Uh oh!

Cueball Apr 25, 2026

Uh oh!

karianna Apr 26, 2026 Author

Uh oh!

gromgit Apr 27, 2026

Uh oh!

Cueball Apr 27, 2026

karianna
Apr 24, 2026

Output of `brew config`

Output of `brew doctor`

Replies: 2 comments 7 replies

daeho-ro
Apr 24, 2026
Collaborator Sponsor

karianna Apr 25, 2026
Author

karianna Apr 25, 2026
Author

daeho-ro Apr 25, 2026
Collaborator Sponsor

bevanjkay Apr 25, 2026
Collaborator

Cueball
Apr 25, 2026

karianna Apr 26, 2026
Author