brew install gcc: The post-install step did not complete successfully

[cobrexus]

I installed Homebrew on Ubuntu on WSL. I have Windows 11 and I am learning Laravel, which requires WSL to run. I installed Homebrew because the instructor used it to install PHP, MySQL, Redis and other Laravel dependencies.

When I installed Homebrew with the command on the homepage and followed the next steps, it advised me to install GCC with brew install gcc, and I did, but I got this warning:

Warning: The post-install step did not complete successfully
You can try again using:
  brew postinstall gcc

When I run brew postinstall gcc I get this warning again.

brew reinstall gcc gives me the same result.

When I run brew update it says it's already up-to-date.

When I run brew doctor, it says that GCC is not installed:

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:
  isl@0.18

Warning: No developer tools installed.
Install Clang or run `brew install gcc`.

[SMillerDev]

Try running brew postinstall --debug gcc and post the output here.

[carlocab]

See https://docs.brew.sh/Homebrew-on-Linux#requirements.

[deepakdp11]

please elaborate what worked

[isikyus]

I had the same issue as @abzr1 describes.

It turned out I'd had errors from a previous apt-get install step, something like this:

Err:1 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 libc-dev-bin amd64 2.35-0ubuntu3.1
  404  Not Found [IP: 91.189.91.83 80]

Running sudo apt-get update, then the command sudo apt-get install build-essential procps curl file git from the linked document, fixed it for me.

[lack-coder]

how can i correct this Warning: The post-install step did not complete successfully
You can try again using:
brew postinstall gcc

[isikyus]

how can i correct this Warning: The post-install step did not complete successfully You can try again using: brew postinstall gcc

There are a number of commands that might help, in abzr1's original post, carlocab's link, and my comment above yours — have you tried any of those? If so, which ones? What was the result?

[RodrigoRVSN]

Had the same problem and doing the step-by-step commented by isikyus solved my issue here in WSL

[sudonam]

run sudo apt install build-essential cause brew need it

[LorenzoBettini]

Maybe I'm missing something, but by installing the requirements as listed here https://docs.brew.sh/Homebrew-on-Linux#requirements for Fedora, I already get gcc installed as a package, so it would not make sense to install it with Homebrew.

[carlocab]

It depends on which version of GCC you want. If you don't care which version you're installing, then, yes, it probably doesn't make sense.

[LorenzoBettini]

Makes sense! ;)
thanks!