php/horde doesn't find pear

Hello: I've just installed php 4.3.8 and Horde 2.2.5. It is not able to find pear, even if I configure well /usr/local/php4/lib/php.ini with include_path=/usr/local/php4/lib/php. /usr/local/php4/ is where I have installed php, and lib/php (relative to the last one) is where php installs pear by default. If installed the packages following the documentation (calling "pear install <package>", with for example "./pear install Mail_Mime", from the /usr/local/php4/bin/ directory), and everything seems to be ok (the binary downloaded things and installed them). But opening /horde/test.php still says: (...) PEAR * PEAR - No * Check your PHP include_path setting to make sure it has the PEAR library directory. * Recent PEAR - No * Mail - No * Log - No * DB - No * Net_Socket - No * Date - No * HTML_Common/HTML_Select - No And opening /horde/imp/ : Warning: main(PEAR.php): failed to open stream: No such file or directory in /usr/local/share/horde-2.2.5/lib/Registry.php on line 13 Fatal error: main(): Failed opening required 'PEAR.php' (include_path='/usr/local/php4/lib/php') in /usr/local/share/horde-2.2.5/lib/Registry.php on line 13 Where is the problem ?? Could it be related with permissions, as I see that all the directories from /usr/local/php4 have the "drwx--S---" permission, with owners "root.staff", and for example I have -rw------- 1 root staff 30154 Aug 16 13:30 PEAR.php /usr/local/php4/lib/php But it should not, because the file /usr/local/php4/lib/php.ini is found and interpreted (when I change include_path it is reflected on the error message), so PEAR.php should be found also. ??? Many thanks, Julian