The second release candidates for the 1.67.0 beta release are now available at: https://dl.bintray.com/boostorg/beta/1.67.0.beta.1/source/ The release notes can be previewed at: http://www.boost.org/users/history/in_progress.html The documentation is available at: http://www.boost.org/doc/libs/1_67_0_beta1/ The SHA256 checksums are as follows: 154cf490da858fd9c2307bb904b07a42cbe8355ecf99d5477f0d843c6d03cdda boost_1_67_0_b1_rc2.7z 0d854b208fefaeb5837d6c417f505b189275e32d017f6226001fb165a5ac51ed boost_1_67_0_b1_rc2.tar.bz2 6eb3f9ca8db355765f41361e1e26976228f0c2dff400aade8a5e97aec6aa59f4 boost_1_67_0_b1_rc2.tar.gz 678a6459f2517932536ec97297be1de46ea073f2e2ee17ec8397b80aa0953f49 boost_1_67_0_b1_rc2.zip 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.