On MacOS Big Sur, running pod install against a simple Podfile is throwing an error in Ruby.

Podfile

	# Uncomment the next line to define a global platform for your project
	# platform :ios, '9.0'
	target 'firebase-ios-demo' do
	# Comment the next line if you don't want to use dynamic frameworks
	#use_frameworks!
	pod 'Firebase/Auth'
	pod 'Firebase/Firestore'
	# Pods for firebase-ios-demo
	target 'firebase-ios-demoTests' do
	inherit! :search_paths
	# Pods for testing
	end
	target 'firebase-ios-demoUITests' do
	# Pods for testing
	end
	end

view raw Podfile Firebase hosted with by GitHub

LoadError – dlsym(0x7fc9ddbb5340, Init_ffi_c): symbol not found – /Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi_c.bundle

	LoadError - dlsym(0x7fc9ddbb5340, Init_ffi_c): symbol not found - /Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi_c.bundle
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi.rb:6:in `rescue in <top (required)>'
	/Library/Ruby/Gems/2.6.0/gems/ffi-1.13.1/lib/ffi.rb:3:in `<top (required)>'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Gems/2.6.0/gems/ethon-0.12.0/lib/ethon.rb:2:in `<top (required)>'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Gems/2.6.0/gems/typhoeus-1.4.0/lib/typhoeus.rb:2:in `<top (required)>'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Site/2.6.0/rubygems/core_ext/kernel_require.rb:92:in `require'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:74:in `cdn_url?'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:36:in `create_source_with_url'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/sources_manager.rb:21:in `find_or_create_source_with_url'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:178:in `block in sources'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:177:in `map'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:177:in `sources'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:1073:in `block in resolve_dependencies'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/user_interface.rb:64:in `section'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:1072:in `resolve_dependencies'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer/analyzer.rb:124:in `analyze'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer.rb:414:in `analyze'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer.rb:239:in `block in resolve_dependencies'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/user_interface.rb:64:in `section'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer.rb:238:in `resolve_dependencies'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/installer.rb:160:in `install!'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/command/install.rb:52:in `run'
	/Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/lib/cocoapods/command.rb:52:in `run'
	/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.0/bin/pod:55:in `<top (required)>'
	/usr/local/bin/pod:23:in `load'
	/usr/local/bin/pod:23:in `<main>'

view raw Ruby Error hosted with by GitHub

To get around this error. It seems you have to install ffi and disable the ffi ruby library that comes shipped with MacOS Big Sur.

sudo gem inst ffi -- --disable-system-libffi
Building native extensions with: '--disable-system-libffi'
This could take a while...
Successfully installed ffi-1.13.1
Parsing documentation for ffi-1.13.1
Done installing documentation for ffi after 3 seconds
1 gem installed

After running the command I can now run pod install successfully.