kena@kenax ....com/cockroachdb/cockroach %  ./dev build cockroach
TMPDIR set to /tmp/tmp.pt7YeG66
$ bazel build //pkg/cmd/cockroach:cockroach --config=with_ui
INFO: Build option --define has changed, discarding analysis cache.
INFO: Repository npm instantiated at:
  /data/home/kena/src/go/src/github.com/cockroachdb/cockroach/WORKSPACE:177:13: in <toplevel>
  /data/home/kena/.cache/bazel/_bazel_kena/9b9f53b7334495d6a871cbb472c466bb/external/build_bazel_rules_nodejs/index.bzl:83:18: in yarn_install
Repository rule yarn_install defined at:
  /data/home/kena/.cache/bazel/_bazel_kena/9b9f53b7334495d6a871cbb472c466bb/external/build_bazel_rules_nodejs/internal/npm_install/npm_install.bzl:917:31: in <toplevel>
ERROR: An error occurred during the fetch of repository 'npm':
   Traceback (most recent call last):
        File "/data/home/kena/.cache/bazel/_bazel_kena/9b9f53b7334495d6a871cbb472c466bb/external/build_bazel_rules_nodejs/internal/npm_install/npm_install.bzl", line 813, column 36, in _yarn_install_impl
                is_windows_host = is_windows_os(repository_ctx)
        File "/data/home/kena/.cache/bazel/_bazel_kena/9b9f53b7334495d6a871cbb472c466bb/external/build_bazel_rules_nodejs/nodejs/private/os_name.bzl", line 65, column 19, in is_windows_os
                return os_name(rctx) == OS_NAMES[0]
        File "/data/home/kena/.cache/bazel/_bazel_kena/9b9f53b7334495d6a871cbb472c466bb/external/build_bazel_rules_nodejs/nodejs/private/os_name.bzl", line 62, column 9, in os_name
                fail("Unsupported operating system {} architecture {}".format(os_name, arch))
Error in fail: Unsupported operating system freebsd architecture amd64