We've created a second release candidate to fix a few issues. The three fixes since RC1 are listed at the end of this mail. The files for 1.56.0 RC2 are available at: http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. The files (and associated md5s) are: MD5 (boost_1_56_0_rc2.7z) = 2e1688886aede1c3348e131a0e73a031 MD5 (boost_1_56_0_rc2.tar.bz2) = 2079fabbfb9fb046e6e12e381eff20fa MD5 (boost_1_56_0_rc2.tar.gz) = 96fe9c5f70759399217dc7ee113ecdd3 MD5 (boost_1_56_0_rc2.zip) = df42b60e120841fc3893de7c2529fc4a Thanks! -- The release managers === Changes Since RC1 === Boost.Thread bug is causing coroutine build to fail on gcc 4.6 in C++11 mode. https://github.com/boostorg/thread/pull/21 Boost.Graph broken on MSVC-12 and gcc-4.4. https://github.com/boostorg/graph/pull/14 Boost.System broken on cygwin, local_free_on_destruction not defined. https://github.com/boostorg/system/pull/4