A recent C run-time update added the poll() function, which we were not testing for at configuration time. The patch below adds that test to configure.com. However, the initial appearance of poll() was not accompanied by poll.h, so the IO extension continues to use its own home-grown version of poll(), which causes a multiply defined symbol error at link time. I've remedied that by adding a macro in ext/IO/poll.h that redefines poll. This is more along the lines of all the other standard library replacements elsewhere in Perl.Thread Next