When using a source plugin with a stage2 compiler built with the devel2 flavour, there are a fair few warnings about hptSomeThingsBelowUs.

WARNING in hptSomeThingsBelowUs
  missing module CoercePlugin
  Probable cause: out-of-date interface files

I don't know if this just started happening or has been going on for a while. Is this warning cause for concern? Everything appears to work as expected despite this hiccup.