~ gem install gosu
Building native extensions. This could take a while...
ERROR:  Error installing gosu:
ERROR: Failed to build gem native extension.

    current directory: /Users/user/.rbenv/versions/3.2.1/lib/ruby/gems/3.2.0/gems/gosu-1.4.6/ext/gosu
/Users/user/.rbenv/versions/3.2.1/bin/ruby extconf.rb
The Gosu gem requires some libraries to be installed system-wide.
See the following site for a list:
https://github.com/gosu/gosu/wiki/Getting-Started-on-OS-X
*** 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:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/user/.rbenv/versions/3.2.1/bin/$(RUBY_BASE_NAME)
extconf.rb:71:in ``': No such file or directory - sdl2-config (Errno::ENOENT)
from extconf.rb:71:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in /Users/user/.rbenv/versions/3.2.1/lib/ruby/gems/3.2.0/gems/gosu-1.4.6 for inspection.
Results logged to /Users/nikita/.rbenv/versions/3.2.1/lib/ruby/gems/3.2.0/extensions/x86_64-darwin-23/3.2.0/gosu-1.4.6/gem_make.out

~ arch
i386

brew install sdl2
brew install sdl2_image
brew install sdl2_mixer
brew install sdl2_ttf
brew install libogg
brew install libvorbis

~ gem install gosu 
Building native extensions. This could take a while...
Successfully installed gosu-1.4.6
Parsing documentation for gosu-1.4.6
Installing ri documentation for gosu-1.4.6
Done installing documentation for gosu after 0 seconds
1 gem installed
~ gem install gosu-examples

Successfully installed gosu-examples-1.0.7
Parsing documentation for gosu-examples-1.0.7
Installing ri documentation for gosu-examples-1.0.7
Done installing documentation for gosu-examples after 0 seconds
1 gem installed

~ gosu-examples
*** Cannot load chipmunk_and_rmagick.rb:
cannot load such file -- chipmunk

*** Cannot load chipmunk_integration.rb:
cannot load such file -- chipmunk

*** Cannot load opengl_integration.rb:
cannot load such file -- opengl

*** Cannot load rmagick_integration.rb:
cannot load such file -- rmagick

These warnings in the terminal (cannot load such file) I will fix later (if needed, of course).