rbenv fails to install any ruby version on Mac OSX Big Sur - 11.4

[Th3G4mbl3r]

I am trying to use rbenv to install Ruby on my mac OSX Big Sur - 11.4.

The command fails with the following errors:

Installing ruby-2.6.7...
mkdir: /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib: Permission denied

BUILD FAILED (macOS 11.4 using ruby-build 20210526)

Inspect or clean up the working tree at /var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.DVy03b
Results logged to /var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.log

Last 10 log lines:
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/scrypt.html
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/SM2.html
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/ssl.html
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/X25519.html
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/X448.html -> /Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/X25519.html
/Users/rohitus/.rbenv/versions/2.6.7/openssl/share/doc/openssl/html/man7/x509.html
/var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.DVy03b ~
~
/var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.DVy03b ~
/var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.DVy03b/ruby-2.6.7 /var/folders/40/c8b3smrj5fz8cv1zqqlc863wh1j1cg/T/ruby-build.20210609173805.99725.DVy03b ~

Triage details

Further debugging of the issue shows that the reason the installation fails for any version of Ruby is because on MacOS X Big Sur 11.4, /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk is not a valid directory location.

This can be seen in the below output:

(⎈ |docker-desktop:default)➜  ~ ls -la /Library/Developer/CommandLineTools/SDKs/                  
  rwxr-xr-x  4  root  wheel   128 B    Thu Jun  3 18:47:42 2021    ./
  rwxr-xr-x  4  root  wheel   128 B    Thu Jun  3 18:30:07 2021    ../
  rwxr-xr-x  7  root  wheel   224 B    Tue Mar 16 22:03:17 2021    MacOSX11.3.sdk/
  rwxr-xr-x  1  root  wheel    14 B    Sat May  1 12:15:33 2021    MacOSX11.sdk  ⇒ MacOSX11.3.sdk

I had to manually create a symlink to bypass the error and continue.

Expected behaviour: Installation of Ruby should be successful. Ideally, rbenv and ruby-build plugin should be able to identify that if it is being installed on MacOS 11 then the directory locations need to be different as compared to versions of MacOS X prior to Big Sur.

[skinnynpale]

+1

[skinnynpale]

@Th3G4mbl3r m1?

[Th3G4mbl3r]

@Th3G4mbl3r m1?

No, Intel based Mac...

[hsbt]

I could install 2.6.7 with macOS 11.4

$ sudo rm -rf (xcode-select -print-path)
Password:
$ xcode-select --install
xcode-select: note: install requested for command line developer tools
$ ls -lA /Library/Developer/CommandLineTools/SDKs/
lrwxr-xr-x root wheel  14 B Thu Jun 17 10:58:36 2021 MacOSX.sdk ⇒ MacOSX11.3.sdk
drwxr-xr-x root wheel 256 B Thu Jun 17 10:58:35 2021 MacOSX10.15.sdk
drwxr-xr-x root wheel 224 B Mon Nov 30 21:33:49 2020 MacOSX11.1.sdk
drwxr-xr-x root wheel 224 B Tue Mar 16 23:03:17 2021 MacOSX11.3.sdk
lrwxr-xr-x root wheel  14 B Thu Jun 17 10:56:07 2021 MacOSX11.sdk ⇒ MacOSX11.3.sdk
$ CFLAGS="-Wno-error=implicit-function-declaration" rbenv install 2.6.7
Installing openssl-1.1.1k...
Installed openssl-1.1.1k to /Users/hsbt/.local/share/rbenv/versions/2.6.7

Installing ruby-2.6.7...
ruby-build: using readline from homebrew
Installed ruby-2.6.7 to /Users/hsbt/.local/share/rbenv/versions/2.6.7