この宝石をインストールしないと、この応答が返されます。
greg@greg-VirtualBox:~$ gem install tweetstream
Building native extensions. This could take a while...
ERROR: Error installing tweetstream:
ERROR: Failed to build gem native extension.
/home/greg/.rvm/rubies/ruby-1.9.3-p362/bin/ruby extconf.rb
checking for main() in -lssl... yes
checking for main() in -lcrypto... yes
checking for openssl/ssl.h... yes
checking for openssl/err.h... yes
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... yes
checking for inotify_init() in sys/inotify.h... yes
checking for writev() in sys/uio.h... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_enable_interrupt()... yes
checking for rb_time_new()... yes
checking for sys/event.h... no
checking for epoll_create() in sys/epoll.h... yes
creating Makefile
make
compiling ssl.cpp
make: g++: Command not found
make: *** [ssl.o] Error 127
Gem files will remain installed in /home/greg/.rvm/gems/ruby-1.9.3- p362/gems/eventmachine-1.0.3 for inspection.
Results logged to /home/greg/.rvm/gems/ruby-1.9.3-p362/gems/eventmachine- 1.0.3/ext/gem_make.out