Unable to install couchbase gem on rails

Currently I used ruby 2.6.3 and rails 6.0.1 and I am unable to install couchbase gem, I keep getting this error when trying to install the gem using command
gem install couchbase

Building native extensions. This could take a while…
ERROR: Error installing couchbase:
ERROR: Failed to build gem native extension.
current directory: /Users/user/.rvm/gems/ruby-2.6.3/gems/couchbase-3.1.1/ext
/Users/user/.rvm/rubies/ruby-2.6.3/bin/ruby -I /Users/user/.rvm/rubies/ruby-2.6.3/lib/ruby/site_ruby/2.6.0 -r ./siteconf20210429-16269-1qsei29.rb extconf.rb
checking for cmake… no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
–without-opt-include={opt-dir}/include --with-opt-lib --without-opt-lib={opt-dir}/lib
extconf.rb:25:in ``’: No such file or directory - --version (Errno::ENOENT)
from extconf.rb:25:in `’

To see why this extension failed to compile, please check the mkmf.log which can be found here:
extconf failed, exit code 1
Gem files will remain installed in /Users/user/.rvm/gems/ruby-2.6.3/gems/couchbase-3.1.1 for inspection.
Results logged to /Users/user/.rvm/gems/ruby-2.6.3/extensions/x86_64-darwin-18/2.6.0/couchbase-3.1.1/gem_make.out

libcouchbase is already installed
brew info libcouchbase

libcouchbase: stable 3.0.7 (bottled), HEAD
C library for Couchbase
/usr/local/Cellar/libcouchbase/3.0.7 (110 files, 4.1MB) *
Poured from bottle on 2021-04-29 at 18:56:19
From: homebrew-core/libcouchbase.rb at b8a6748e8af26ef35bb6cea8a6c7523a38249e0a · Homebrew/homebrew-core · GitHub
License: Apache-2.0
==> Dependencies
Build: cmake
Required: libev :heavy_check_mark: , libevent :heavy_check_mark: , libuv :heavy_check_mark: , openssl@1.1 :heavy_check_mark:
==> Options
Install HEAD version
==> Analytics
install: 674 (30 days), 1,734 (90 days), 7,217 (365 days)
install-on-request: 662 (30 days), 1,709 (90 days), 6,943 (365 days)
build-error: 0 (30 days

What did i miss?