Excerpts from Amadeusz Żołnowski's message of 2011-11-26 21:51:21 +0100:
> If symbol-test is built in symbol-hiding with hardcoded g++
> invokation, it's not so easy to pass $(srcdir) which is required to
> find notmuch.h when srcdir and builddir are separate directories.

Sorry, I've just realised that I've forgot to add symbol-test to clean
target.  Following patch includes clean, too.

-- 
Amadeusz Żołnowski