Exactly why does rntcl give a warning? Is there some new way of building that I should know about?

checking if /export/aphraelraid/home/peter/hack/Pike/7.5/build/windows_xp-5.1.2600-x86/smartlink exists is up to date and works... no configure: WARNING:

rntcc/rntcl/rnticl/rntecl detected.

checking for gcc... /usr/bin/gcc Using /usr/bin/gcc to compile smartlink. checking whether smartlink compiles... no - use the sh script