I have some problem cocoapods installation

Question

I am trying to install cocoapods to my MacBook and after I ran this code into the terminal gem install cocoapods I get the following error:

****** ~ % sudo gem install cocoapods

    Password:
    Building native extensions. This could take a while...
    ERROR:  Error installing cocoapods:
    ERROR: Failed to build gem native extension.

    current directory: /Library/Ruby/Gems/2.6.0/gems/ffi-1.12.2/ext/ffi_c
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20200413-663-1dklrnl.rb extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/include/ruby.h

You might have to install separate package for the ruby development
environment, ruby-dev or ruby-devel for example.

extconf failed, exit code 1

Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/ffi-1.12.2 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/ffi-1.12.2/gem_make.out

Answer 1

Looks like you don't have installed Ruby development headers.

You can fix this by installing Xcode command-line tools by executing these two commands:

xcode-select --install
sudo xcodebuild -license

Changes will apply after the computer restart.

Answer 2

Goto Xcode preferences then click on Locations -> Command Line Tools -> Click on the drop down and check if any of it is available. If yes then select and set it. Then try to install cocoa pods it works as expected.

If no option is available in the drop down for Command Line Tools then use following commnands

xcode-select --install
sudo xcodebuild -license