Unable to load dynamic library

["Jeff Tanner" <jeff.tanner@xxxxxxxxxxxxxxxx>]

Title: Unable to load dynamic library

I did a build of PHP 5.1.4, and it created and applied shared extensions within:
Installing shared extensions:     /usr/local/lib/php/extensions/no-debug-non-zts-20050922/

Performed for several extensions "sudo peardev install pecl/pdo"... /apc, ... /json, ... /memcache, etc...
And all extensions were loaded into:
/usr/local/lib/php/extensions/no-debug-non-zts-20050922/

I verified that these extensions were either added by the PHP build or by
jeff@us:/usr/local/lib/php/extensions/no-debug-non-zts-20050922$ ls -al
total 4532
drwxr-xr-x 2 root root    4096 2007-10-26 17:17 .
drwxr-xr-x 3 root root    4096 2007-10-26 17:19 ..
-rwxr-xr-x 1 root root  426596 2007-10-26 15:27 apc.so
-rwxr-xr-x 1 root root   94377 2007-10-26 14:27 json.so
-rwxr-xr-x 1 root root  197098 2007-10-26 16:56 memcache.so
-rwxr-xr-x 1 root root  132023 2007-10-26 17:17 pdo_mysql.so
-rwxr-xr-x 1 root root  283629 2007-10-26 17:17 pdo.so
-rwxr-xr-x 1 root root 1463264 2007-10-26 17:17 pdo_sqlite.so
-rwxr-xr-x 1 root root  669722 2007-10-25 13:12 xdebug.so

And I modified php.ini:
extension=apc.so
extension=memcache.so
extension=pdo.so
extension=pdo_mysql.so
extension=pdo_sqlite.so
extension=json.so

IN addition I added [xdebug] extension
zend_extension="/usr/local/lib/php/extensions/no-debug-non-zts-20050922/xdebug.so"


However, when starting a php page with phpinfo(), the PHP info shows the [xdebug] info, but fails to show the other shared extensions:
jeff@us:/var/log/apache2$ tail error.log
PHP Warning:  PHP Startup: Unable to load dynamic library './apc.so' - ./apc.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library './memcache.so' - ./memcache.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library './pdo.so' - ./pdo.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library './pdo_mysql.so' - ./pdo_mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library './pdo_sqlite.so' - ./pdo_sqlite.so: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library './json.so' - ./json.so: cannot open shared object file: No such file or directory in Unknown on line 0

What am I doing wrong???

-- Jeff in Seattle