$load_average on FreeBSD?

on FreeBSD 8.1, "/proc/loadavg" doesn't exist.

in

/gallery3/modules/gallery/helpers/gallery_block.php

case "platform_info":
      $block->css_id = "g-platform";
      $block->title = t("Platform information");
      $block->content = new View("admin_block_platform.html");
      if (@is_readable("/proc/loadavg") && $first_line = current(@file("/proc/loadavg"))) {
        $block->content->load_average =
          join(" ", array_slice(explode(" ", $first_line), 0, 3));
      } else {
        $block->content->load_average = t("Unavailable");
      }
      break;

how would I modify the code so that output of

sysctl vm.loadavg

or

sysctl vm.loadavg | awk '{ print $3, $4, $5}'

is displayed instead?

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