https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63907
--- Comment #13 from David Vitek <dvitek at grammatech dot com> --- Created attachment 43639 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43639&action=edit hack for g++4.5.3 and old libc compatibility This is a nasty hack and you should check that your system's definition of PTHREAD_COND_INITIALIZER is all zeroes before using it.