[horde] ActiveSync installation problem

[Harlan]

Hello,
   When I go into Admin->Config from the webmail interface, I get this 
error:
Class 'Horde_ActiveSync_State_Sql' not found
   Google searches tell me I need to install ActiveSync.  Ok.  No 
problem, sort of:

# pear install --alldeps horde/Horde_ActiveSync
Package "pear.horde.org/Horde_Mapi" dependency 
"pear.php.net/Math_BigInteger" has no releases
horde/Horde_Mapi requires package "pear/Math_BigInteger" (version >= 
1.0.2, version <= 2.0.0, excluded versions: 2.0.0)
horde/Horde_ActiveSync requires package "horde/Horde_Mapi" (version >= 
1.0.0, version <= 2.0.0alpha1, excluded versions: 2.0.0alpha1)
No valid packages found
install failed
# pear install --alldeps horde/Horde_Mapi
Package "pear.horde.org/Horde_Mapi" dependency 
"pear.php.net/Math_BigInteger" has no releases
horde/Horde_Mapi requires package "pear/Math_BigInteger" (version >= 
1.0.2, version <= 2.0.0, excluded versions: 2.0.0)
No valid packages found
install failed
# pear install --alldeps horde/Horde_BigInteger
No releases available for package "pear.horde.org/Horde_BigInteger"
install failed

# pear list -c pear.horde.org
Installed packages, channel pear.horde.org:
===========================================
Package                      Version State
Horde_Alarm                  2.2.10  stable
Horde_Argv                   2.1.0   stable
Horde_Auth                   2.2.2   stable
Horde_Autoloader             2.1.2   stable
Horde_Browser                2.0.16  stable
Horde_Cache                  2.5.5   stable
Horde_Cli                    2.3.0   stable
Horde_Compress               2.2.1   stable
Horde_Compress_Fast          1.1.1   stable
Horde_Constraint             2.0.3   stable
Horde_Controller             2.0.5   stable
Horde_Core                   2.31.7  stable
Horde_Crypt                  2.7.12  stable
Horde_Crypt_Blowfish         1.1.2   stable
Horde_CssMinify              1.0.4   stable
Horde_Css_Parser             1.0.11  stable
Horde_Data                   2.1.4   stable
Horde_Date                   2.4.1   stable
Horde_Date_Parser            2.0.6   stable
Horde_Dav                    1.1.4   stable
Horde_Db                     2.4.0   stable
Horde_Editor                 2.0.5   stable
Horde_ElasticSearch          1.0.4   stable
Horde_Exception              2.0.8   stable
Horde_Feed                   2.0.4   stable
Horde_Form                   2.0.19  stable
Horde_Group                  2.1.1   stable
Horde_HashTable              1.2.6   stable
Horde_History                2.3.6   stable
Horde_Http                   2.1.7   stable
Horde_Icalendar              2.1.8   stable
Horde_Idna                   1.1.1   stable
Horde_Image                  2.6.0   stable
Horde_Imap_Client            2.29.16 stable
Horde_Imsp                   2.0.10  stable
Horde_Injector               2.0.5   stable
Horde_Itip                   2.1.2   stable
Horde_JavascriptMinify       1.1.5   stable
Horde_JavascriptMinify_Jsmin 1.0.2   stable
Horde_Kolab_Format           2.0.9   stable
Horde_Kolab_Server           2.0.5   stable
Horde_Kolab_Session          2.0.3   stable
Horde_Kolab_Storage          2.2.3   stable
Horde_ListHeaders            1.2.5   stable
Horde_Lock                   2.1.4   stable
Horde_Log                    2.3.0   stable
Horde_LoginTasks             2.0.7   stable
Horde_Mail                   2.6.4   stable
Horde_Mail_Autoconfig        1.0.3   stable
Horde_Mime                   2.11.0  stable
Horde_Mime_Viewer            2.2.2   stable
Horde_Mongo                  1.1.0   stable
Horde_Nls                    2.2.1   stable
Horde_Notification           2.0.4   stable
Horde_Oauth                  2.0.4   stable
Horde_OpenXchange            1.0.1   stable
Horde_Pack                   1.0.7   stable
Horde_Perms                  2.1.7   stable
Horde_Prefs                  2.9.0   stable
Horde_Queue                  1.1.5   stable
Horde_Rdo                    2.1.0   stable
Horde_Role                   1.0.1   stable
Horde_Routes                 2.0.5   stable
Horde_Rpc                    2.1.8   stable
Horde_Scribe                 2.0.3   stable
Horde_Secret                 2.0.6   stable
Horde_Serialize              2.0.5   stable
Horde_Service_Facebook       2.0.10  stable
Horde_Service_Gravatar       1.0.1   stable
Horde_Service_Twitter        2.1.6   stable
Horde_Service_Weather        2.5.4   stable
Horde_SessionHandler         2.2.9   stable
Horde_Share                  2.2.0   stable
Horde_Smtp                   1.9.5   stable
Horde_Socket_Client          2.1.2   stable
Horde_SpellChecker           2.1.3   stable
Horde_Stream                 1.6.3   stable
Horde_Stream_Filter          2.0.4   stable
Horde_Stream_Wrapper         2.1.4   stable
Horde_Support                2.2.0   stable
Horde_SyncMl                 2.0.7   stable
Horde_Template               2.0.3   stable
Horde_Test                   2.6.3   stable
Horde_Text_Diff              2.2.0   stable
Horde_Text_Filter            2.3.6   stable
Horde_Text_Flowed            2.0.3   stable
Horde_Thrift                 2.0.3   stable
Horde_Timezone               1.1.0   stable
Horde_Token                  2.0.9   stable
Horde_Translation            2.2.2   stable
Horde_Tree                   2.0.5   stable
Horde_Url                    2.2.6   stable
Horde_Util                   2.5.8   stable
Horde_Vfs                    2.4.0   stable
Horde_View                   2.0.6   stable
Horde_Xml_Element            2.0.4   stable
Horde_Xml_Wbxml              2.0.3   stable
content                      2.0.6   stable
horde                        5.2.20  stable
horde_lz4                    1.0.10  stable
imp                          6.2.23  stable
kronolith                    4.2.27  stable
wicked                       2.0.8   stable

   As far as I know, everything is reasonably update to date.

   Anyone have any suggestions on what I'm missing?  Or what I should be 
doing instead?

Thanks,

Harlan...