PHP + Pear|Pyrus + Mail; Mail can't find Pear.php

I've been banging my head on this for weeks now. I've found many people with similar issues, and have gotten a little farther towards solving my issue, but not all the way.

WAMPserver 2.5 (PHP 5.5.12)

I originally installed Pear, but something was messed up (paths in config were crazy?), so I tried installing again, and then things got really messed up, so I removed everything Pear-related (except the pear subdir because Windows complained that a file in it was in use, even though it was empty), and gave Pyrus a shot. Now things seem to be working better at least as package management.

I believe I have my include_path(s) set correctly because now my script can at least find the Mail.php script.

include_path = ".;C:\wamp\bin\php\php5.5.12\pear\php"

my call, working:

include_once("Mail.php");

However, Mail.php is now complaining that it can't find Pear.php:

Failed opening required 'PEAR.php' (include_path='.;C:\wamp\bin\php\php5.5.12\pear\php') in C:\wamp\bin\php\php5.5.12\pear\php\Mail.php on line 46

There is no Pear.php file anywhere under \php5.5.12.

Is this happening because I'm using Pyrus, and Mail is set up to work in a Pear environment? (Even though Pyrus claims to be "Using PEAR installation found at C:\wamp\bin\php\php5.5.12\pear", see below.) Do I have to install both Pear and Pyrus? Should I use pyrus.phar to install Pear? As noted above, previous attempts to install Pear were less than successful. The documentation for both Pear and Pyrus could be improved by having a graphic depicting how a standard install ought to look like in terms of subdirs, etc. This is how my include_path branch looks like now:

c:\wamp\bin\php\php5.5.12\pear\php>tree /f
Folder PATH listing for volume OS
Volume serial number is A4D7-1271
C:.
│   Mail.php
│
├───Auth
│   │   SASL.php
│   │
│   └───SASL
│           Anonymous.php
│           Common.php
│           CramMD5.php
│           DigestMD5.php
│           External.php
│           Login.php
│           Plain.php
│           SCRAM.php
│
├───Mail
│       mail.php
│       mock.php
│       null.php
│       RFC822.php
│       sendmail.php
│       smtp.php
│       smtpmx.php
│
└───Net
        SMTP.php
        Socket.php

Here's my Pyrus config:

c:\wamp\bin\php\php5.5.12>php pyrus.phar get
Pyrus version 2.0.0a4 SHA-1: 72271D92C3AA1FA96DF9606CD538868544609A52
Using PEAR installation found at C:\wamp\bin\php\php5.5.12\pear
System paths:
  php_dir => C:\wamp\bin\php\php5.5.12\pear\php
  ext_dir => c:\wamp\bin\php\php5.5.12\ext\
  cfg_dir => C:\wamp\bin\php\php5.5.12\pear\cfg
  doc_dir => C:\wamp\bin\php\php5.5.12\pear\docs
  bin_dir => C:\wamp\bin\php\php5.5.12
  data_dir => C:\wamp\bin\php\php5.5.12\pear\data
  www_dir => C:\wamp\bin\php\php5.5.12\pear\www
  test_dir => C:\wamp\bin\php\php5.5.12\pear\tests
  src_dir => C:\wamp\bin\php\php5.5.12\pear\src
  php_bin => C:\wamp\bin\php\php5.5.12\php.exe
  php_ini => C:\wamp\bin\php\php5.5.12\php.ini
  php_prefix =>
  php_suffix =>
Custom System paths:
User config (from C:\Users\mrz\pear\pearconfig.xml):
  default_channel => pear2.php.net
  auto_discover => 0
  http_proxy =>
  cache_dir => C:\wamp\bin\php\php5.5.12\pear\cache
  temp_dir => C:\wamp\bin\php\php5.5.12\pear\temp
  verbose => 1
  preferred_state => stable
  umask => 0022
  cache_ttl => 3600
  my_pear_path => C:\wamp\bin\php\php5.5.12\pear
  plugins_dir => C:\Users\mrz\pear
(variables specific to pear2.php.net):
  username =>
  password =>
  preferred_mirror => pear2.php.net
  download_dir => C:\wamp\bin\php\php5.5.12\pear\downloads
  openssl_cert =>
  handle =>
  paranoia => 2
Custom User config (from C:\Users\mrz\pear\pearconfig.xml):
(variables specific to pear2.php.net):

Any help will be greatly appreciated.