ucture (<code>Make.pkg</code>, <code>Make.cmd</code>, and so on) should
switch to using the <code>go</code> command for building Go code and, if
necessary, rewrite their makefiles to perform any auxiliary build tasks.
</p>

<h2 id="cmd_cgo">The cgo command</h2>

<p>
In Go 1, the <a href="/cmd/cgo">cgo command</a>
uses a different <code>_cgo_export.h</code>
file, which is generated for packages containing <code>//export</code> lines.
The <code>_cgo_export.h</code> file now begins with the C preamble comment,