memcache

XAMPP is an absolutely wonderful, packaged, self-contained distribution of apache, mysql, php and tons of hard-to-install php extensions. Not only does it make sysadmin's life easier, by solving 99.9% of LAMP problems out-of-the-box, but it also allows PHP-vendors to create packaged distributions of complex systems.

However, even with a long list of packaged extensions, obviously there may be a need to install an additional one. PECL Memcache client of memcached distributed cache server, is a very probable candidate for high-load systems.

Unfortunately, PECL is broken in a vanilla XAMPP installation with php4. Typically you won't be able to use "pecl" directly and when you try to install manually with phpize you will get an error like:
" PHP Warning: Unknown(): Unable to load dynamic library '/opt/lampp/lib/php/extensions/no-debug-non-zts-20020429/memcache.so' - /opt/lampp/lib/php/extensions/no-debug-non-zts-20020429/memcache.so: undefined symbol: OnUpdateLong in Unknown on line 0"