Looks like libwww did not install libwwwdir.so, which tetex wants. I'll see if a newer version of libwww can be induced to cough up the library. Stay tuned to this bug.
Created attachment 99658 [details] tetex-2.0.2-r8 emerge failure logfile Log output from tetex emerge attempt
*** This bug has been marked as a duplicate of 150198 ***