При установке puma gem я получал следующую ошибку:
$ gem install puma Fetching: puma-2.11.2.gem (100%) Building native extensions. This could take a while... ERROR: Error installing puma: ERROR: Failed to build gem native extension. ruby extconf.rb checking for BIO_read() in -lcrypto... no checking for BIO_read() in -llibeay32... no *** extconf.rb failed ***