linker error with BOOST_PROCESS_USE_STD_FS when using process_environment

[pgit]

When using boost::process:v2 with a process_environment for passing environment, there is a linker error about on_setup(..., std::filesystem::path, ...) when BOOST_PROCESS_USE_STD_FS is defined: https://godbolt.org/z/azbrYesMj

undefined reference to `boost::process::v2::process_environment::on_setup(boost::process::v2::posix::default_launcher&, std::filesystem::__cxx11::path const&, char const* const*)

When re-compiling Boost with BOOST_PROCESS_USE_STD_FS, it works again. Now this isn't really surprising, as there are two different on_setup versions, one using boost::filesystem and another one using std::filesystem.: The pre-compiled boost_process library defined and exported on_setup differently than my code using BOOST_PROCESS_USE_STD_FS.

Is there maybe a way to put that function into a header file, or export both variants?