Description:
------------
I'm trying to document this for Phabricator but can't figure 
out how to install via pecl. I'd prefer not to give end 
users build-from-source instructions, even though the process 
isn't too difficult. Transcript in repro below.

I think my system configuration is fine; I was able to install 
it afterward by doing a github clone, cd'ing into 
"extension/", and then running "phpize && ./configure && make 
&& sudo make install". It would just be nice if a pecl 
install worked so I could provide simpler install instructions 
to users. This process also didn't add xhprof to my 
php.ini so I had to do that separately, which is another step 
to document.

Reproduce code:
---------------
$ sudo pecl install xhprof
Failed to download pecl/xhprof within preferred state "stable", latest release is version 0.9.2, stability "beta", use "channel://pecl.php.net/xhprof-0.9.2" to install
install failed

$ sudo pecl install channel://pecl.php.net/xhprof-0.9.2
downloading xhprof-0.9.2.tgz ...
Starting to download xhprof-0.9.2.tgz (931,660 bytes)
............................................done: 931,660 bytes
11 source files, building
running: phpize
Cannot find config.m4.
Make sure that you run '/usr/bin/phpize' in the top level source directory of the module

ERROR: `phpize' failed

$ pecl version
PEAR Version: 1.9.0
PHP Version: 5.3.5
Zend Engine Version: 2.3.0
Running on: Linux ip-10-170-207-10 2.6.34.7-56.40.amzn1.x86_64 #1 SMP Fri Oct 22 18:48:49 UTC 2010 x86_64


Expected result:
----------------
xhprof is installed on the system and to php.ini.

Actual result:
--------------
pecl-driven installation fails and requires build from source.