Windows向けXAMPP v5.6.15で pear installがエラーになる

Windows7にXAMPP v5.6.15をインストール。
pearコマンドでHTTP_Clientを追加しようとしたらエラーになった。
サンプルを格納するフォルダが作成できない?

c:\xampp\php>pear install HTTP_Client
WARNING: "pear/HTTP_Client" is deprecated in favor of "pear/HTTP_Request2"
WARNING: channel "pear.php.net" has updated its protocols, use "pear channel-upd
ate pear.php.net" to update
WARNING: "pear/HTTP_Request" is deprecated in favor of "pear/HTTP_Request2"
downloading HTTP_Client-1.2.1.tgz ...
Starting to download HTTP_Client-1.2.1.tgz (10,269 bytes)
.....done: 10,269 bytes
ERROR: failed to mkdir C:\php\pear\docs\HTTP_Client\examples

pearの設定を確認。確かにドキュメントの格納先が C:\php\pear\docs となっているが、
そんなフォルダはない。

c:\xampp\php>pear config-show
CONFIGURATION (CHANNEL PEAR.PHP.NET):
=====================================
Auto-discover new Channels     auto_discover    <not set>
Default Channel                default_channel  pear.php.net
...
PEAR documentation directory   doc_dir          C:\php\pear\docs
...
User Configuration File        Filename         C:\Windows\pear.ini
System Configuration File      Filename         C:\Windows\pearsys.ini

フォルダを作成する。

c:\xampp\php>mkdir c:\php
c:\xampp\php>mkdir c:\php\pear
c:\xampp\php>mkdir c:\php\pear\docs

今度はインストールに成功。

c:\xampp\php>pear install HTTP_Client
WARNING: "pear/HTTP_Client" is deprecated in favor of "pear/HTTP_Request2"
WARNING: channel "pear.php.net" has updated its protocols, use "pear channel-upd
ate pear.php.net" to update
WARNING: "pear/HTTP_Request" is deprecated in favor of "pear/HTTP_Request2"
downloading HTTP_Client-1.2.1.tgz ...
Starting to download HTTP_Client-1.2.1.tgz (10,269 bytes)
.....done: 10,269 bytes
install ok: channel://pear.php.net/HTTP_Client-1.2.1

XAMPPの入手はこちら。

XAMPP Installers and Downloads for Apache Friends
https://www.apachefriends.org/jp/index.html