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enable mod_cache in apache2

if you're using debian linux and want to activate mod_cache by apache remeber not only to type

a2enmod mem_cache (or disk_cache)

but also

a2enmod cache

or apache will fail to start and will give error

apache2: Syntax error on line 185 of /etc/apache2/apache2.conf: Syntax error on line 2 of /etc/apache2/mods-enabled/mem_cache.load: Cannot load /usr/lib/apache2/modules/mod_mem_cache.so into server: /usr/lib/apache2/modules/mod_mem_cache.so: undefined symbol: ap_cache_cacheable_hdrs_out