sudo gem install --include-dependencies slinky
root's password:
INFO:  `gem install -y` is now default and will be removed
INFO:  use --ignore-dependencies to install only the gems you list
Building native extensions.  This could take a while...
ERROR:  Error installing slinky:
        ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9 extconf.rb
checking for main() in -lssl... no
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
sh: make: command not found


Gem files will remain installed in /usr/lib64/ruby/gems/1.9.1/gems/eventmachine-1.0.3 for inspection.
Results logged to /usr/lib64/ruby/gems/1.9.1/gems/eventmachine-1.0.3/ext/gem_make.out