pear failing to install include files properly

I'm trying to get two linters, PHPMD and PHP Code Sniffer, installed
with PEAR. But when I try to run phpmd or phpcs, they show some
errors.

$ phpmd hello.php

Warning: require_once(PHP/PMD/TextUI/Command.php): failed to open
stream: No such file or directory in /Users/andrew/pear/bin/phpmd on
line 45

Fatal error: require_once(): Failed opening required
'PHP/PMD/TextUI/Command.php' (include_path='.:') in
/Users/andrew/pear/bin/phpmd on line 45

$ phpcs hello.php

Warning: include_once(PHP/CodeSniffer/CLI.php): failed to open stream:
No such file or directory in /Users/andrew/pear/bin/phpcs on line 31

Warning: include_once(): Failed opening 'PHP/CodeSniffer/CLI.php' for
inclusion (include_path='.:') in /Users/andrew/pear/bin/phpcs on line
31

Fatal error: Class 'PHP_CodeSniffer_CLI' not found in
/Users/andrew/pear/bin/phpcs on line 34

These seem to indicate that pear isn't adding them to the default
include path during installation.

$ specs php os
Specs:

specs 0.7
https://github.com/mcandre/specs#readme

pear version
PEAR Version: 1.9.4
PHP Version: 5.4.17
Zend Engine Version: 2.4.0
Running on: Darwin mockingjay.westell.com 13.0.0 Darwin Kernel Version
13.0.0: Thu Sep 19 22:22:27 PDT 2013;
root:xnu-2422.1.72~6/RELEASE_X86_64 x86_64

php --version
PHP 5.4.17 (cli) (built: Aug 25 2013 02:03:38)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

system_profiler SPSoftwareDataType | grep 'System Version'
      System Version: OS X 10.9 (13A603)

-- 
Cheers,

Andrew Pennebaker
www.yellosoft.us