Unable to install thin gem on macOS 11.0 Big Sur beta about thin

[mszyndel]

Alternative solution that has worked for me was

gem install thin -v '1.6.4' -- --with-cflags="-Wno-error=implicit-function-declaration"

This didn't require me to install XCode, just Command Line Tools

[WillSewell]

If you are using bundle install, you will need to run

bundle config build.thin --with-cflags="-Wno-error=implicit-function-declaration"

[kellishaver]

If you're in a situation where you can't upgrade the gem, upgrading to XCode 11.7 will fix the error above.

Note that if you've previously installed stand-alone command line tools, you'll have to switch to the ones included with XCode via sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

[hugocorbucci]

Just followed the suggestion from @mszyndel on Monterey and it worked just fine:

 gem install thin -v '1.6.4' -- --with-cflags="-Wno-error=implicit-function-declaration"

[timohuovinen]

This also worked for me

gem install thin 1.6.4 -- --build-flags --with-cflags="-Wno-error=unused-const-variable"  

[kellishaver]

Do you want to make a PR to update the README with those details @kellishaver ?

Would be happy to! I'll do this tonight.

[ZASMan]

No luck with any of the solutions here for Monterey. Anyone else have this problem?

[yijia-zhan]

Catalina 10.15.6 has the exact same error:

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.15.6
BuildVersion:	19G73

[yahonda]

Opened a pull request #366

[yahonda]

It should be addressed by #364.

[yahonda]

Closing because #364 has been merged to master branch.

[ioquatix]

Do you want to make a PR to update the README with those details @kellishaver ?