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.
I have successfully built the libraries with Homebrew Clang 21.1.4 on an M4 Mac with macOS 26.0.1 using cxxstd=11,14,17,20,23,2c Two notes: 1) bootstrap.sh fails with linker errors if Homebrew clang is your system default instead of Apple's clang. This can be worked around by manually specifying a different toolset in bootstrap.sh on line 12 (e.g. TOOLSET="gcc" worked for me). A gist with the log can be found here: https://gist.github.com/mborland/356cdda75f37d9a6a23aa2ecc82acfb5 2) Almost everything builds successfully with Homebrew GCC 15.2.0 with the same language standards except Boost.Context (and libs that use context). This issue was present in 1.89. Heres a gist with the reduced log: https://gist.github.com/mborland/d2f08e82180ce2ed88af0470dddda1f2 Matt