/usr/share/request-tracker3.8/lib/RT/FM/ is in rt3.8-rtfm 2.4.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/request-tracker3.8/lib/RT/FM/Article.pm
/usr/share/request-tracker3.8/lib/RT/FM/ArticleCollection.pm
/usr/share/request-tracker3.8/lib/RT/FM/ArticleCollection_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Article_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Class.pm
/usr/share/request-tracker3.8/lib/RT/FM/ClassCollection.pm
/usr/share/request-tracker3.8/lib/RT/FM/ClassCollection_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Class_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Introduction.pod
/usr/share/request-tracker3.8/lib/RT/FM/ObjectTopic.pm
/usr/share/request-tracker3.8/lib/RT/FM/ObjectTopicCollection.pm
/usr/share/request-tracker3.8/lib/RT/FM/ObjectTopicCollection_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Record.pm
/usr/share/request-tracker3.8/lib/RT/FM/SearchBuilder.pm
/usr/share/request-tracker3.8/lib/RT/FM/System.pm
/usr/share/request-tracker3.8/lib/RT/FM/Topic.pm
/usr/share/request-tracker3.8/lib/RT/FM/TopicCollection.pm
/usr/share/request-tracker3.8/lib/RT/FM/TopicCollection_Overlay.pm
/usr/share/request-tracker3.8/lib/RT/FM/Topic_Overlay.pm