ign">-&gt;</span>&nbsp;int&nbsp;=&nbsp;<span class="string">"caml_sys_system_command"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;time&nbsp;:&nbsp;unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;(float&nbsp;[@unboxed])&nbsp;=&nbsp;<span class="string">"caml_sys_time"</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="string">"caml_sys_time_unboxed"</span>&nbsp;[@@noalloc]<br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;chdir&nbsp;:&nbsp;string&nbsp;<span class="keywordsig