'emerge dev-lang/tk-8.3.3' fails to find dev-lang/tcl-8.3.3. most likely, dev-lang/tk-8.3.3's package needs to be modified to look for the latest version of dev-lang/tcl-8.3.3 (in this case, dev-lang/tcl-8.3.3-r1), assuming of course that the two versions are compatible.
it has been modified a while ago. please emerge --clean rsync and also rm /var/cache/edb/dep/*