else:
      syslibs = ','.join(sorted(syslibs.split()))
    write_action_env_to_bazelrc('TF_SYSTEM_LIBS', syslibs)

  for varname in ('PREFIX', 'LIBDIR', 'INCLUDEDIR', 'PROTOBUF_INCLUDE_PATH'):
    if varname in environ_cp:
      write_to_bazelrc('build --define=%s=%s' % (varname, environ_cp[varname]))


def set_windows_build_flags(environ_cp):
  """Set Windows specific build options."""

}

// cover runs, in effect,
//
//	go tool cover -mode=b.coverMode -var="varName" -o dst.go src.go
func (b *Builder) cover(a *Action, dst, src string, varName string) error {
	return b.Shell(a).run(a.Objdir, "", nil,
		cfg.BuildToolexec,
		base.Tool("cover"),
		"-mode", a.Package.Internal.Cover.Mode,
		"-var", varName,
		"-o", dst,
		src)
}

// cover2 runs, in effect,
//