Hi, (CC'ed to boost and boost-build) Two of Boost.Geometry users reported that peculiar error, [1] and [2] ``` /home/digu_j/boost/tools/build/src/tools/features/warnings-feature.jam:27: in load ERROR: rule "[[bbv2.builtin.features.warnings]]`warnings`::" unknown in module "warnings-feature". ``` and I'm having a hard time understanding what is going wrong here and what causes this issue, on Linux. The line 27 is a typical Jam line: ``` feature.feature warnings : on all extra pedantic off : incidental propagated ; ``` but this refers to something that puzzles me most ``` ERROR: rule "[[bbv2.builtin.features.warnings]]`warnings`::" unknown ``` a bit of comment block? ``` #| tag::doc[] [[bbv2.builtin.features.warnings]]`warnings`:: ``` Is this a parsing issue? Is this related to potentially existing system-wide installation of Boost.Build? If yes, why none of the dumps in [1] and [2] refer to any files in /usr? [1] ./b2 headers attempt https://github.com/boostorg/geometry/pull/667#issuecomment-584794370 [2] b2 attempt to build a program in libs/geometry https://github.com/boostorg/geometry/pull/665#issuecomment-595595900 Best regards, -- Mateusz Loskot, http://mateusz.loskot.net