whatweb cant find getoptlong

ive installed ruby with pacman (pacman -S ruby) and getoptlong with gem (gem install getoptlong) but i stll cant run it and it says it cant find it

/usr/lib/ruby/3.4.0/did_you_mean/core_ext/name_error.rb:11: warning: getoptlong is not part of the default gems starting from Ruby 3.4.0. Install getoptlong from RubyGems.
<internal:/usr/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:136:in 'Kernel#require': cannot load such file -- getoptlong (LoadError)
	from <internal:/usr/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:136:in 'Kernel#require'
	from /home/username/WhatWeb-0.5.2/lib/whatweb.rb:22:in '<top (required)>'
	from <internal:/usr/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:136:in 'Kernel#require'
	from <internal:/usr/lib/ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:136:in 'Kernel#require'
	from ./whatweb:37:in '<main>'

whatweb version: 0.5.2
ruby version: ruby 3.4.5 (2025-07-16 revision 20cda200d3) +PRISM [x86_64-linux]