CMAKE_FASTBUILD_CAPTURE_SYSTEM_ENV

.. versionadded:: 4.2

Controls capturing of the system environment into fbuild.bff. Setting it to OFF makes the invocation of all tools (compilers and other external processes) hermetic.

.. note::

Setting this variable to OFF can break MSVC toolchains that rely on environment variables such as INCLUDE or LIB unless these are manually configured elsewhere.

Defaults to ON.