Errors since updating PHP to 5.4

Hello all,
I updated PHP to 5.4 yesterday and I have been having various issues since.
We have managed to make most of them disappear, or at least not get posted all over the websites for all visitors to see, however some are still having issues.

An example is that most of the websites that are hosted on my server get these 3 errors:

[11-Dec-2012 13:24:21 Europe/Helsinki] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20100525/suhosin.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20100525/suhosin.so: cannot open shared object file: No such file or directory in Unknown on line 0

[11-Dec-2012 13:24:21 Europe/Helsinki] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20100525/imagick.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20100525/imagick.so: cannot open shared object file: No such file or directory in Unknown on line 0

[11-Dec-2012 13:24:21 Europe/Helsinki] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20100525/sqlite.so' - /usr/local/lib/php/extensions/no-debug-non-zts-20100525/sqlite.so: cannot open shared object file: No such file or directory in Unknown on line 0


I found out that suhosin.so is not compatible with PHP 5.4. But what about the others? How can I fix these errors?