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Overview
Have both projects checked out to the same root projects folder. You will not have to modify dspace-discovery at all, but the patch will enable the dspace-trunk to use some features of dspace services, and include other libraries such as org.apache.solr that are needed.
The discovery module essentially adds an additional core to solr. Existing was statistics, the new core is search. 

Obtain the updated patch

To patch: 

cd /path/to/project/discovery/dspace-trunk/dspace 
patch -p1 < /path/to/dspace-discovery-updateupdate3.patch 

If you name discovery-trunk anything other than that, you will have to modify dspace-trunk/dspace/pom.xml accordingly.
Then the regular rebuild process applies.

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