Installing Ruby with rbenv on MacOS Big Sur

rbenv_macos_bigsur.md

Errors/Problems with Install

In attempting to install Ruby with rbenv, I ran into the following build failures:

BUILD FAILED (macOS 11.2.3 using ruby-build 20210423)

Inspect or clean up the working tree at /var/folders/58/16lnyx815c183j6wzcbl_thc0000gn/T/ruby-build.20210426232453.81982.XfAg0C
Results logged to /var/folders/58/16lnyx815c183j6wzcbl_thc0000gn/T/ruby-build.20210426232453.81982.log

Last 10 log lines:
                                          ^
In file included from vm.c:350:
./vm_method.c:124:5: warning: function 'rb_f_notimplement' declared 'noreturn' should not return [-Winvalid-noreturn]
    UNREACHABLE_RETURN(Qnil);
    ^
./include/ruby/ruby.h:59:35: note: expanded from macro 'UNREACHABLE_RETURN'
#  define UNREACHABLE_RETURN(val) return (val)
                                  ^
1 warning and 1 error generated.
make: *** [vm.o] Error 1

Resolution

/usr/sbin/pkgutil --packages | grep CL didn't return anything initally, which mean that I had an old version of CommandLineTools and there's no way to update them per se, so I just had to remove and install fresh:

sudo rm -rf /Library/Developer/CommandLineTools
sudo xcode-select --install

/usr/sbin/pkgutil --packages | grep CL now returns:

com.apple.pkg.CLTools_Executables
com.apple.pkg.CLTools_SDK_macOS110
com.apple.pkg.CLTools_SDK_macOS1015
com.apple.pkg.CLTools_macOS_SDK

Final Build Settings

brew install rbenv ruby-build openssl readline libyaml zlib

I ended up adding this to my ~/.zshrc:

# rbenv
export RUBY_CFLAGS="-Wno-error=implicit-function-declaration"
export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1) --with-readline-dir=$(brew --prefix readline) --with-libyaml-dir=$(brew --prefix libyaml) --with-zlib-dir=$(brew --prefix zlib)"

# Load rbenv
eval "$(rbenv init -)"

rbenv install 2.7.3 (or whatever version you fancy) should work now :)

Thanks for this! I didn't have any CLTools installed, and had a different build error, but I just ran export CFLAGS="-Wno-error=implicit-function-declaration" in my shell and I was immediately able to rbenv install 2.6.7 =)

This was s new approach thanks although still getting this issue:

BUILD FAILED (macOS 12.2.1 using ruby-build 20220218)

Inspect or clean up the working tree at /var/folders/63/q749dy7s50z8hrgbc3n_rx9m0000gp/T/ruby-build.20220218141457.52642.4iHwuJ
Results logged to /var/folders/63/q749dy7s50z8hrgbc3n_rx9m0000gp/T/ruby-build.20220218141457.52642.log

Last 10 log lines:
    UNREACHABLE_RETURN(Qnil);
    ^
./include/ruby/ruby.h:59:35: note: expanded from macro 'UNREACHABLE_RETURN'
#  define UNREACHABLE_RETURN(val) return (val)
                                  ^

Following up, I actually managed to get it to work with this line:
RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" RUBY_CFLAGS="-w" rbenv install 2.7.5

Nice! So the openssl version made difference there? Thanks for letting me know!

had similar issues as above. This is recipe that helped me

1. follow resolution from above to install xcode tools
2. make sure to have readline from brew brew install rbenv ruby-build openssl
3. RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" RUBY_CFLAGS="-w" rbenv install 2.7.5 finally passed

had similar issues as above. This is recipe that helped me

1. follow resolution from above to install xcode tools
2. make sure to have readline from brew brew install rbenv ruby-build openssl
3. RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" RUBY_CFLAGS="-w" rbenv install 2.7.5 finally passed

Nice! It's work for me

had similar issues as above. This is recipe that helped me

1. follow resolution from above to install xcode tools
2. make sure to have readline from brew brew install rbenv ruby-build openssl
3. RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" RUBY_CFLAGS="-w" rbenv install 2.7.5 finally passed

It worked for me while installing Ruby 2.5.8 on MacOS 13.

RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)" RUBY_CFLAGS="-w" rbenv install 2.7.5

this worked for me on mac m1

It worked for me on MacBook Air