Undefined method spawn on Kernel - Zookeeper rbx -X18 mode #2006

gistfile1.txt

$> SPAWN_ZOOKEEPER='true' RBXOPT=-X18 rbx -G -S rake
cd ext
rake clean
make clean
rm Makefile
cd -
cd ext
rake
tar -zxf zkc-3.3.5.tar.gz
ruby extconf.rb
Zkc already built; run 'rake clobber' in ext/ first if you need to rebuild.
checking for rb_thread_blocking_region()... no
creating Makefile
make
gcc -I. -I. -I/home/jesse/.rvm/rubies/rbx-head/vm/capi/18/include -I. -I/home/je
sse/.rvm/usr/include -I/usr/local/include  -fPIC  -I/tmp/zookeeper/ext/include  
-L/tmp/zookeeper/ext/lib -L/home/jesse/.rvm/rubies/rbx-head/lib -g -fPIC -O2 -I/
home/jesse/.rvm/usr/include -I/usr/local/include -DZKRB_RUBY_187  -c zkrb.c
gcc -I. -I. -I/home/jesse/.rvm/rubies/rbx-head/vm/capi/18/include -I. -I/home/je
sse/.rvm/usr/include -I/usr/local/include  -fPIC  -I/tmp/zookeeper/ext/include  
-L/tmp/zookeeper/ext/lib -L/home/jesse/.rvm/rubies/rbx-head/lib -g -fPIC -O2 -I/
home/jesse/.rvm/usr/include -I/usr/local/include -DZKRB_RUBY_187  -c event_lib.c

gcc -I. -I. -I/home/jesse/.rvm/rubies/rbx-head/vm/capi/18/include -I. -I/home/je
sse/.rvm/usr/include -I/usr/local/include  -fPIC  -I/tmp/zookeeper/ext/include  
-L/tmp/zookeeper/ext/lib -L/home/jesse/.rvm/rubies/rbx-head/lib -g -fPIC -O2 -I/
home/jesse/.rvm/usr/include -I/usr/local/include -DZKRB_RUBY_187  -c zkrb_wrappe
r.c
gcc -I. -I. -I/home/jesse/.rvm/rubies/rbx-head/vm/capi/18/include -I. -I/home/je
sse/.rvm/usr/include -I/usr/local/include  -fPIC  -I/tmp/zookeeper/ext/include  
-L/tmp/zookeeper/ext/lib -L/home/jesse/.rvm/rubies/rbx-head/lib -g -fPIC -O2 -I/
home/jesse/.rvm/usr/include -I/usr/local/include -DZKRB_RUBY_187  -c zkrb_wrappe
r_compat.c
gcc -shared -o zookeeper_c.so zkrb.o event_lib.o zkrb_wrapper.o zkrb_wrapper_com
pat.o -L/tmp/zookeeper/ext/lib -Wl,-R/tmp/zookeeper/ext/lib -L/tmp/zookeeper/ext
/lib -L/home/jesse/.rvm/rubies/rbx-head/lib  -L/home/jesse/.rvm/usr/lib -L/usr/l
ocal/lib        -lzookeeper_st_gem
cd -
/home/jesse/.rvm/rubies/rbx-head/bin/rbx -S rspec ./spec/c_zookeeper_spec.rb ./s
pec/chrooted_connection_spec.rb ./spec/compatibilty_spec.rb ./spec/default_watch
er_spec.rb ./spec/em_spec.rb ./spec/ext/zookeeper_base_spec.rb ./spec/forked_con
nection_spec.rb ./spec/latch_spec.rb ./spec/zookeeper_spec.rb
ZK::Server::Config#initialize {}


Finished in 0.07255 seconds
0 examples, 0 failures
An exception occurred running at_exit handlers
    undefined method `spawn' on Kernel (Module) (NoMethodError)

Backtrace:
            Kernel(Module)#spawn (method_missing) at kernel/delta/kernel.rb:81
                   ZK::Server::SubProcess#spawn! at /home/jesse/.rvm/gems/rbx-head/gems/zk-server-1.1.5
                                                    /lib/zk-server/sub_process.rb:152
                      ZK::Server::SubProcess#run at /home/jesse/.rvm/gems/rbx-head/gems/zk-server-1.1.5
                                                    /lib/zk-server/sub_process.rb:110
                           { } in ZK::Server.run at /home/jesse/.rvm/gems/rbx-head/gems/zk-server-1.1.5
                                                    /lib/zk-server.rb:68
               Kernel(ZK::Server::SubProcess)#tap at kernel/common/kernel.rb:241

                                  ZK::Server.run at /home/jesse/.rvm/gems/rbx-head/gems/zk-server-1.1.5
                                                    /lib/zk-server.rb:68
                         { } in Object#__script__ at spec/spec_helper.rb:39
 RSpec::Core::Hooks::Hook(RSpec::Core::Hooks::BeforeHook)#call at /home/jesse/.rvm/gems/rbx-head/gems
                                                                  /rspec-core-2.8.0/lib/rspec/core
                                                                  /hooks.rb:24
           RSpec::Core::Hooks::BeforeHook#run_in at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/hooks.rb:37
  { } in RSpec::Core::Hooks::BeforeHooks#run_all at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/hooks.rb:70
      Array(RSpec::Core::Hooks::BeforeHooks)#each at kernel/bootstrap/array.rb:68
         RSpec::Core::Hooks::BeforeHooks#run_all at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/hooks.rb:70
 RSpec::Core::Hooks(RSpec::Core::Configuration)#run_hook at /home/jesse/.rvm/gems/rbx-head/gems
                                                            /rspec-core-2.8.0/lib/rspec/core/hooks.rb:368
             { } in RSpec::Core::CommandLine#run at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/command_line.rb:27
                    RSpec::Core::Reporter#report at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/reporter.rb:34
                    RSpec::Core::CommandLine#run at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/command_line.rb:25
              RSpec::Core::Runner.run_in_process at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/runner.rb:80

                         RSpec::Core::Runner.run at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/runner.rb:69

              { } in RSpec::Core::Runner.autorun at /home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0
                                                    /lib/rspec/core/runner.rb:10

                    Rubinius::Loader#run_at_exits at kernel/loader.rb:696
                        Rubinius::Loader#epilogue at kernel/loader.rb:716
                            Rubinius::Loader#main at kernel/loader.rb:849
rake aborted!
/home/jesse/.rvm/rubies/rbx-head/bin/rbx -S rspec ./spec/c_zookeeper_spec.rb ./spec/chrooted_connection_spec.rb ./spec/compatibilty_spec.rb ./spec/default_watch
er_spec.rb ./spec/em_spec.rb ./spec/ext/zookeeper_base_spec.rb ./spec/forked_connection_spec.rb ./spec/latch_spec.rb ./spec/zookeeper_spec.rb failed
/home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0/lib/rspec/core/rake_task.rb:137:in `initialize'
/home/jesse/.rvm/gems/rbx-head/gems/rspec-core-2.8.0/lib/rspec/core/rake_task.rb:127:in `initialize'
kernel/bootstrap/array.rb:68:in `each'
/tmp/zookeeper/releaseops/lib/releaseops/test_tasks.rb:21:in `define_simple_default_for_travis'
kernel/bootstrap/array.rb:68:in `each'
kernel/bootstrap/array.rb:68:in `each'
kernel/bootstrap/array.rb:68:in `each'
kernel/common/kernel.rb:597:in `load'
kernel/delta/codeloader.rb:68:in `load_script'
kernel/delta/codeloader.rb:118:in `load_script'
kernel/loader.rb:614:in `script'
kernel/loader.rb:815:in `main'
Tasks: TOP => spec:runner
(See full trace by running task with --trace)