EM doesn't compile on 2.2.0p0

gistfile1.txt

gem+ eventmachine -v '1.0.3'
Building native extensions.  This could take a while...
ERROR:  Error installing eventmachine:
	ERROR: Failed to build gem native extension.

    /home/jesse/.rubies/ruby-2.2.0/bin/ruby -r ./siteconf20141226-13786-zj9j4y.rb extconf.rb
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... no
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()... no
checking for rb_time_new()... yes
checking for sys/event.h... no
checking for epoll_create() in sys/epoll.h... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling binder.cpp
compiling pipe.cpp
compiling rubymain.cpp
compiling em.cpp
em.cpp: In member function ‘void EventMachine_t::_RunEpollOnce()’:
em.cpp:574:37: error: ‘rb_thread_select’ was not declared in this scope
   EmSelect (0, NULL, NULL, NULL, &tv);
                                     ^
em.cpp: In member function ‘int SelectData_t::_Select()’:
em.cpp:827:67: error: ‘rb_thread_select’ was not declared in this scope
  return EmSelect (maxsocket+1, &fdreads, &fdwrites, &fderrors, &tv);
                                                                   ^
em.cpp: In member function ‘void EventMachine_t::_RunSelectOnce()’:
em.cpp:946:40: error: ‘rb_thread_select’ was not declared in this scope
      EmSelect (0, NULL, NULL, NULL, &tv);
                                        ^
Makefile:229: recipe for target 'em.o' failed
make: *** [em.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/jesse/.gem/ruby/2.2.0/gems/eventmachine-1.0.3 for inspection.
Results logged to /home/jesse/.gem/ruby/2.2.0/extensions/x86_64-linux/2.2.0-static/eventmachine-1.0.3/gem_make.out