Libmemcached is layed out by interface version. The 1.0 version would be found in: libmemcached-1.0/memcached.h

The historic libmemcached/memcached.h includes libmemcached-1.0/memcached.h. For best practice you should include the version of libmemcacached that you used during development.

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Introducing the C Client Library for memcached

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