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/usr/share/doc/libapr-memcache0/README is in libapr-memcache0 0.7.0-3.

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To use apr_memcache with APR-Util 0.9.x, you should apply the 
'relist_invalidate.patch'.

This change is included in APR-Util 1.x, and in APR-Util 0.9.x from 
Subversion.