git -c advice.detachedHead=false clone --branch develop --single-branch --depth 1 https://github.com/boostorg/boost.git git -c advice.detachedHead=false submodule update --init --recursive ./bootstrap.sh --with-toolset=gcc --with-libraries=context ./b2 -d+2 --debug-configuration --debug-building --debug-generator headers context-impl=fcontext toolset=gcc cxxstd=20 notice: found boost-build.jam at /boostorg/boost-build.jam notice: loading B2 from /boostorg/tools/build/src/build-system.jam notice: Searching <redacted> for site-config configuration file 'site-config.jam'. notice: Configuration file 'site-config.jam' not found in <redacted>. notice: Searching <redacted> for user-config configuration file 'user-config.jam'. notice: Configuration file 'user-config.jam' not found in <redacted>. notice: Searching '.' for project-config configuration file 'project-config.jam'. notice: Loading project-config configuration file 'project-config.jam' from '.'. notice: will use 'g++' for gcc, condition <toolset>gcc-11 notice: using gcc libraries :: <toolset>gcc-11 :: /usr/bin /usr/lib /usr/lib32 /usr/lib64 notice: using gcc archiver :: <toolset>gcc-11 :: /usr/bin/ar warning: toolset gcc initialization: can not find tool windres warning: initialized from project-config.jam:12 notice: using rc compiler :: <toolset>gcc-11 :: /usr/bin/as /boostorg/tools/build/src/build/feature.jam:327: in validate-feature from module feature error: unknown feature "<context-impl>" /boostorg/tools/build/src/build/feature.jam:361: in expand-subfeatures-aux from module feature /boostorg/tools/build/src/build/feature.jam:422: in feature.expand-subfeatures from module feature /boostorg/tools/build/src/build/build-request.jam:20: in apply-to-property-set from module build-request (builtin):-1: in sequence.transform from module sequence /boostorg/tools/build/src/build/build-request.jam:32: in build-request.expand-no-defaults from module build-request /boostorg/tools/build/src/build-system.jam:778: in module scope from module build-system The feature is present: grep -A5 -n "feature.feature context-impl" libs/context/build/Jamfile.v2 52:feature.feature context-impl 53- : fcontext 54- ucontext 55- winfib 56- : propagated 57- composite I'm not familiar with the Jam DSL, so I'm not sure how to debug this further. Any advice is very welcome. Thanks. - Tim