Bug: source type fails to compile

[faxm0dem]

puppet-syslog_ng(0)master⚡ puppet apply tests/source.pp
Could not retrieve fact='networking', resolution='<anonymous>': uninitialized constant Sysfs
Notice: Scope(Class[Syslog_ng::Reload]): syslog_ng::reload: syntax_check_before_reloads=true
Notice: Scope(Class[Syslog_ng::Reload]): syslog_ng::reload: check_syntax_command=/usr/sbin/syslog-ng --syntax-only --cfgfile /tmp/syslog-ng.conf.tmp
Notice: Scope(Class[Syslog_ng]): tmp_config_file: /tmp/syslog-ng.conf.tmp
Error: undefined method `build' for nil:NilClass at /home/fwernli/.puppet/modules/syslog_ng/manifests/source.pp:12 on node ccfawe.in2p3.fr
Wrapped exception:
undefined method `build' for nil:NilClass
Error: undefined method `build' for nil:NilClass at /home/fwernli/.puppet/modules/syslog_ng/manifests/source.pp:12 on node ccfawe.in2p3.fr

[faxm0dem]

It seems this is a docbug, I'll fix it in a minute