Greetings! I have released Version 0.7 of the Memcached Functions for MySQL. This release mainly consists of modifications to the autoconf/automake files that caused some users problems linking to libmemcached, hence the UDFs failing. This should fix that problem, although I would like to make the "fix" I made a better fix.
BTW, did I mention how much autoconf/automake perplexes me and drives me crazy at times?!