1.86.0 build fails on NetBSD

[moubctez]

libs/process/src/ext/cmd.cpp: In function 'boost::process::v2::shell boost::process::v2::ext::cmd(boost::process::v2::pid_type, boost::system::error_code&)':
libs/process/src/ext/cmd.cpp:315:61: error: could not convert 'vec' from 'std::vector<std::__cxx11::basic_string<char> >' to 'boost::process::v2::shell'
  315 |     if (!kd) {BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec) return vec;}
      |                                                             ^~~
      |                                                             |
      |                                                             std::vector<std::__cxx11::basic_string<char> >
libs/process/src/ext/cmd.cpp:326:12: error: could not convert 'vec' from 'std::vector<std::__cxx11::basic_string<char> >' to 'boost::process::v2::shell'
  326 |     return vec;
      |            ^~~
      |            |
      |            std::vector<std::__cxx11::basic_string<char> >

    "g++"   -fvisibility-inlines-hidden -pthread -O3 -finline-functions -Wno-inline -Wall -fvisibility=hidden  -DBOOST_ALL_NO_LIB=1 -DBOOST_ASIO_NO_DEPRECATED -DBOOST_ATOMIC_STATIC_LINK=1 -DBOOST_COBALT_USE_STD_PMR=1 -DBOOST_FILESYSTEM_STATIC_LINK=1 -DBOOST_PROCESS_SOURCE=1 -DNDEBUG   -I"."  -c -o "bin.v2/libs/process/build/gcc-12/release/arm_64/link-static/pch-off/threading-multi/visibility-hidden/ext/cmd.o" "libs/process/src/ext/cmd.cpp"