by Prateek Sachan.
There was a slight confusion regarding the apache solr readme. I confirmed with those people. So, the module could be compiled w/o any dependencies on the used webserver.
Sorry, for the slight mess up here.
I will be listing down the dependencies over here (which is not yet final and will be updated): http://docs.moodle.org/dev/Global_search_%28GSoC2013%29#Installation