title: Invalid Podfile file: undefined method `enable_user_defined_build_types!'
body: <p>I have installing gem on a Macbook Pro running Big Sur and M1 chip. I have followed the instructions given, added these two lines on top of my Podfile</p>
  <pre><code>plugin 'cocoapods-user-defined-build-types'
  enable_user_defined_build_types!
  </code></pre>
  <p>then I am running the command</p>
  <pre><code>sudo gem install 'cocoapods-user-defined-build-types'
  </code></pre>
  <p>and gem is getting installed see below -</p>
  <pre><code>Successfully installed cocoapods-user-defined-build-types-0.0.7
  Parsing documentation for cocoapods-user-defined-build-types-0.0.7
  Done installing documentation for cocoapods-user-defined-build-types after 0 seconds
  1 gem installed
  </code></pre>
  <p>Now, as soon as I run pod install, I get this error -</p>
  <pre><code>[!] Invalid Podfile file: undefined method `enable_user_defined_build_types!' for #&lt;Pod::Podfile:0x0000000145251098 @defined_in_file=#&lt;Pathname
  </code></pre>
  <p>Any idea what excatly is the problem here?</p>