Returns a true value if and only if <c>flagname</c> is included in <c>USE</c>

      Returns a true value if and only if <c>flagname</c> is enabled.

      The condition is inverted if prefixed with an exclamation mark,

      <c>!flagname</c>.

      It is guaranteed that <c>use</c> produces no output.

      As <c>use</c>, guaranteed to produce no output.

      Deprecated synonym for <c>use</c>.

      Returns true if <c>flag</c> is included in the flag list <c>string</c> (example:

      Returns true if <c>flag</c> is included in the flag list <c>string</c>

      <c>if has ccache $FEATURES ; then</c>).

      (example: <c>if has ccache $FEATURES ; then</c>).

      The condition is inverted if prefixed with an exclamation mark,

      <c>!flag</c>.

      It is guaranteed that <c>has</c> produces no output.

      As <c>has</c>, guaranteed quiet.

      Deprecated synonym for <c>has</c>.

You must not rely upon <c>use</c> producing an output <d/> this no longer happens.

It is guaranteed that <c>use</c> produces no output. If you need output

If you really need output displayed, use the <c>usev</c> function. The

displayed, use the <c>usev</c> function; it echoes the USE flag's name

<c>useq</c> function is available for explicitly requesting no output.

if the condition is met.

The <c>useq</c> function is a deprecated synonym for <c>use</c>, don't

use it in new code.

    if useq ppc-macos ; then

    if use ppc-macos ; then