Disable warnings-are-errors in mongo source; gcc 4.8.1 generates extra warnings, which cause the build to fail.
Add missing includes.. without these I get a build failure with:
CMakeFiles/robomongo.dir/robomongo/core/domain/MongoCollectionInfo.cpp.o: In function `Robomongo::MongoCollectionInfo::MongoCollectionInfo(mongo::BSONObj)':
robomongo/src/robomongo/core/domain/MongoCollectionInfo.cpp:7: undefined reference to `mongo::BSONObj::getStringField(char const*) const'
robomongo/src/robomongo/core/domain/MongoCollectionInfo.cpp:14: undefined reference to `mongo::BSONObj::getIntField(char const*) const'