I tried installing the latest version of Ruby 3.1.2 using:
rbenv install 3.2.1
But got the following error:
- BUILD FAILED (macOS 11.2.3 using ruby-build 20210309) - Inspect or clean up the working tree at `/var/folders/.....`
I managed to fix this by running the following:
CFLAGS="-Wno-error=implicit-function-declaration" RUBY_CONFIGURE_OPTS='--with-readline-dir=/usr/local/opt/readline/' arch -x86_64 rbenv install 3.1.2