title: cocoapods install failed, extconf failed, exit code 1, The compiler failed to generate an executable file. (RuntimeError)
body: <p>apple@Apples-MacBook-Pro ~ % gem install cocoapods
  Building native extensions. This could take a while...
  ERROR:  Error installing cocoapods:
  ERROR: Failed to build gem native extension.</p>
  <pre><code>current directory: /Users/apple/.gem/gems/ffi-1.15.5/ext/ffi_c
  </code></pre>
  <p>/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 ./siteconf20220205-1416-c2i0ye.rb extconf.rb
  checking for ffi.h... *** 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.</p>
  <p>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=/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/$(RUBY_BASE_NAME)
  --with-ffi_c-dir
  --without-ffi_c-dir
  --with-ffi_c-include
  --without-ffi_c-include=${ffi_c-dir}/include
  --with-ffi_c-lib
  --without-ffi_c-lib=${ffi_c-dir}/lib
  --enable-system-libffi
  --disable-system-libffi
  --with-libffi-config
  --without-libffi-config
  --with-pkg-config
  --without-pkg-config
  /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:467:in <code>try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:585:in </code>block in try_compile'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:534:in <code>with_werror' from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:585:in </code>try_compile'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:1109:in <code>block in have_header' from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:959:in </code>block in checking_for'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:361:in <code>block (2 levels) in postpone' from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:331:in </code>open'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:361:in <code>block in postpone' from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:331:in </code>open'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:357:in <code>postpone' from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:958:in </code>checking_for'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/mkmf.rb:1108:in <code>have_header' from extconf.rb:10:in </code>system_libffi_usable?'
  from extconf.rb:42:in `'</p>
  <p>To see why this extension failed to compile, please check the mkmf.log which can be found here:</p>
  <p>/Users/apple/.gem/extensions/universal-darwin-20/2.6.0/ffi-1.15.5/mkmf.log</p>
  <p>extconf failed, exit code 1</p>
  <p>Gem files will remain installed in /Users/apple/.gem/gems/ffi-1.15.5 for inspection.
  Results logged to /Users/apple/.gem/extensions/universal-darwin-20/2.6.0/ffi-1.15.5/gem_make.out</p>