"Puppet::Error: Cannot determine basic system flavour" on OpenBSD

Running puppetserver 0.2.0 with:

java -cp /usr/local/share/puppetserver/puppet-server-release.jar clojure.main -m puppetlabs.trapperkeeper.main services --config /etc/puppetserver/conf.d/ -b /etc/puppetserver/bootstrap.cfg

results in:

Cannot run on Microsoft Windows without the win32-process, win32-dir and win32-service gems: Win32API only supported on win32
Puppet::Error: Cannot determine basic system flavour
(root) at /usr/local/lib/ruby/site_ruby/2.0/puppet/feature/base.rb:32
require at org/jruby/RubyKernel.java:1065
(root) at /usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1
require at /usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55
Puppet at /usr/local/lib/ruby/site_ruby/2.0/puppet.rb:75
require at org/jruby/RubyKernel.java:1065
(root) at /usr/local/lib/ruby/site_ruby/2.0/puppet.rb:29
(root) at /usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1
require at org/jruby/RubyKernel.java:1065
require at /usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55
(root) at file:/usr/local/share/puppetserver/puppet-server-release.jar!/puppet-server-lib/puppet/server/master.rb:1
invoke at jruby_puppet_core.clj:118
invoke at jruby_puppet_core.clj:131
invoke at jruby_puppet_core.clj:121
invoke at jruby_puppet_core.clj:222
invoke at jruby_puppet_core.clj:210
invoke at jruby_puppet_service.clj:29
invoke at internal.clj:246
invoke at internal.clj:230
shutdown_on_error at internal.clj:285
invoke at internal.clj:254
invoke at internal.clj:254
invoke at core.clj:619
doInvoke at core.clj:2396
invoke at jruby_puppet_service.clj:28
invoke at core.clj:1836
Exception in thread "main" java.lang.IllegalStateException: There was a problem adding a JRubyPuppet instance to the pool.
at puppetlabs.services.jruby.jruby_puppet_core$eval6471$prime_pools_BANG__6472$fn_6473.invoke(jruby_puppet_core.clj:228) [103/249]
at puppetlabs.services.jruby.jruby_puppet_core$eval6471$prime_pools_BANG___6472.invoke(jruby_puppet_core.clj:210)
at puppetlabs.services.jruby.jruby_puppet_service$reify_6636$service_fnk5254auto_positional$reify6647$fn6648$fn_6649.invoke(jruby_puppet_service.clj:29)
at puppetlabs.trapperkeeper.internal$shutdown_on_error_STAR_.invoke(internal.clj:246)
at puppetlabs.trapperkeeper.internal$shutdown_on_error_STAR_.invoke(internal.clj:230)
at puppetlabs.trapperkeeper.internal$shutdown_service$reify_5853$service_fnk5254auto_positional$reify_5858.shutdown_on_error(internal.clj:285)
at puppetlabs.trapperkeeper.internal$eval5789$fn_5801$G5775_5809.invoke(internal.clj:254)
at puppetlabs.trapperkeeper.internal$eval5789$fn_5801$G5774_5818.invoke(internal.clj:254)
at clojure.lang.AFn.applyToHelper(AFn.java:167)
at clojure.lang.AFn.applyTo(AFn.java:151)
at clojure.core$apply.invoke(core.clj:619)
at clojure.core$partial$fn__4190.doInvoke(core.clj:2396)
at clojure.lang.RestFn.invoke(RestFn.java:421)
at puppetlabs.services.jruby.jruby_puppet_service$reify_6636$service_fnk5254auto_positional$reify6647$fn_6648.invoke(jruby_puppet_service.clj:28)
at clojure.core$binding_conveyor_fn$fn__4107.invoke(core.clj:1836)
at clojure.lang.AFn.call(AFn.java:18)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.jruby.embed.EvalFailedException: (Error) Cannot determine basic system flavour
at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:133)
at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1317)
at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1310)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)
at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28)
at puppetlabs.services.jruby.jruby_puppet_core$create_scripting_container.invoke(jruby_puppet_core.clj:118)
at puppetlabs.services.jruby.jruby_puppet_core$eval6346$create_jruby_instance_6347$fn_6348.invoke(jruby_puppet_core.clj:131)
at puppetlabs.services.jruby.jruby_puppet_core$eval6346$create_jruby_instance__6347.invoke(jruby_puppet_core.clj:121)
at puppetlabs.services.jruby.jruby_puppet_core$eval6471$prime_pools_BANG__6472$fn_6473.invoke(jruby_puppet_core.clj:222)
... 19 more
Caused by: org.jruby.exceptions.RaiseException: (Error) Cannot determine basic system flavour
at RUBY.(root)(/usr/local/lib/ruby/site_ruby/2.0/puppet/feature/base.rb:32)
at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1065)
at RUBY.(root)(/usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1)
at RUBY.require(/usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55)
at RUBY.Puppet(/usr/local/lib/ruby/site_ruby/2.0/puppet.rb:75)
at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1065)
at RUBY.(root)(/usr/local/lib/ruby/site_ruby/2.0/puppet.rb:29)
at RUBY.(root)(/usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:1)
at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1065)
at RUBY.require(/usr/local/share/puppetserver/puppet-server-release.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/core_ext/kernel_require.rb:55)
at RUBY.(root)(file:/usr/local/share/puppetserver/puppet-server-release.jar!/puppet-server-lib/puppet/server/master.rb:1)
at puppetlabs.services.jruby.jruby_puppet_core$create_scripting_container.invoke(jruby_puppet_core.clj:118)
at puppetlabs.services.jruby.jruby_puppet_core$eval6346$create_jruby_instance_6347$fn_6348.invoke(jruby_puppet_core.clj:131)
at puppetlabs.services.jruby.jruby_puppet_core$eval6346$create_jruby_instance__6347.invoke(jruby_puppet_core.clj:121)
at puppetlabs.services.jruby.jruby_puppet_core$eval6471$prime_pools_BANG__6472$fn_6473.invoke(jruby_puppet_core.clj:222)
at puppetlabs.services.jruby.jruby_puppet_core$eval6471$prime_pools_BANG___6472.invoke(jruby_puppet_core.clj:210)
at puppetlabs.services.jruby.jruby_puppet_service$reify_6636$service_fnk5254auto_positional$reify6647$fn6648$fn_6649.invoke(jruby_puppet_service.clj:29)
at puppetlabs.trapperkeeper.internal$shutdown_on_error_STAR_.invoke(internal.clj:246)
at puppetlabs.trapperkeeper.internal$shutdown_on_error_STAR_.invoke(internal.clj:230)
at puppetlabs.trapperkeeper.internal$shutdown_service$reify_5853$service_fnk5254auto_positional$reify_5858.shutdown_on_error(internal.clj:285)
at puppetlabs.trapperkeeper.internal$eval5789$fn_5801$G5775_5809.invoke(internal.clj:254)
at puppetlabs.trapperkeeper.internal$eval5789$fn_5801$G5774_5818.invoke(internal.clj:254)
at clojure.core$apply.invoke(core.clj:619)
at clojure.core$partial$fn__4190.doInvoke(core.clj:2396)
at puppetlabs.services.jruby.jruby_puppet_service$reify_6636$service_fnk5254auto_positional$reify6647$fn_6648.invoke(jruby_puppet_service.clj:28)
at clojure.core$binding_conveyor_fn$fn__4107.invoke(core.clj:1836)

Having a quick look at puppet/feature/base.rb it seems that Puppet suddenly no longer recognizes OpenBSD as having the 'posix' feature? Running the Ruby puppetmaster on the same machine works.