Install 2.x, 3.x version of Ruby via rbenv on M1 Mac

I bought new M1 Mac and struggled to install Ruby.

Here’s what I did to solve the issue.

This solution worked for me installing Ruby 2.6.6 and 3.0.2.

1. Installed anyenv via brew
   

   brew install anyenv
   

2. Installed rbenv via anyenv
   

   anyenv install rbenv
   

3. Then I got an error while installing Ruby rbenv install 2.6.6
   

   rbenv install 2.6.6
   Downloading openssl-1.1.1q.tar.gz...
   -> https://dqw8nmjcqpjn7.cloudfront.net/d7939ce614029cdff0b6c20f0e2e5703158a489a72b2507b8bd51bf8c8fd10ca
   Installing openssl-1.1.1q...
   
   BUILD FAILED (macOS 12.3 using ruby-build 20220630-3-g2155888)
   
   Inspect or clean up the working tree at /var/folders/7w/__wt6xg10rv3jdq_z2rjt8300000gn/T/ruby-build.20220706155948.38261.B1lwKj
   Results logged to /var/folders/7w/__wt6xg10rv3jdq_z2rjt8300000gn/T/ruby-build.20220706155948.38261.log
   
   Last 10 log lines:
   clang  -Iinclude -arch arm64 -O3 -Wall -D_REENTRANT -DZLIB -DZLIB_SHARED -DNDEBUG -I/Users/yas/.anyenv/envs/rbenv/versions/2.6.6/include  -MMD -MF test/wpackettest.d.tmp -MT test/wpackettest.o -c -o test/wpackettest.o test/wpackettest.c
   clang  -Iinclude -arch arm64 -O3 -Wall -D_REENTRANT -DZLIB -DZLIB_SHARED -DNDEBUG -I/Users/yas/.anyenv/envs/rbenv/versions/2.6.6/include  -MMD -MF test/x509_check_cert_pkey_test.d.tmp -MT test/x509_check_cert_pkey_test.o -c -o test/x509_check_cert_pkey_test.o test/x509_check_cert_pkey_test.c
   test/v3ext.c:201:24: error: implicitly declaring library function 'memcmp' with type 'int (const void *, const void *, unsigned long)' [-Werror,-Wimplicit-function-declaration]
           if (!TEST_true(memcmp(ip1->data, ip2->data, ip1->length) <= 0))
                          ^
   test/v3ext.c:201:24: note: include the header <string.h> or explicitly provide a declaration for 'memcmp'
   1 error generated.
   make[1]: *** [test/v3ext.o] Error 1
   make[1]: *** Waiting for unfinished jobs....
   make: *** [all] Error 2
   

4. This error is related to Openssl

   1. His post was so helpful.
      https://github.com/rbenv/ruby-build/discussions/1853#discussioncomment-2146106

      Fundamentally speaking, it is caused by OpenSSL.
      OpenSSL@3.0 came in Sep 2021, but it was not compatible with ruby-build. So we have to switch the OpenSSL@1.1.

5. Installed openssl version 1.1 using brew
   

   brew install openssl@1.1
   

6. Then set PATH to openssl@1.1
   

   yas@MBP2 ~> which openssl
   /usr/bin/openssl
   yas@MBP2 ~> fish_add_path /opt/homebrew/opt/openssl@1.1/bin // set PATH. this is for fish shell.
   // if you use other than fish, add '/opt/homebrew/opt/openssl@1.1/bin' to your PATH.
   yas@MBP2 ~> exec $SHELL -l //refresh shell
   yas@MBP2 ~> which openssl
   /opt/homebrew/opt/openssl@1.1/bin/openssl
   

7. Install Ruby using a prefix
   

   CFLAGS="-Wno-error=implicit-function-declaration" rbenv install 2.6.6
   

Hope this helps