Note that this solution assumes you have previously resolved the general issue of getting c++11 syntax working. Now, eclipse can resolve references to array properly. Select Project -> C/C+ Index -> Rebuild - if that operation did not automatically trigger. On that page under Languages, select GNU C++.Select Project -> Properties -> C/C++ General -> C/C++ Paths and Symbols -> Symbols.Hence, I had to adjust the instructions slightly. I tried the solution provided by schorsch312, and it worked except the steps presented are not exactly consistent with my Neon version of Eclipse (same version used by OP). I have #include and F3 successfully navigates to the array header file. All the symbols present on the current design layer will be selected as confirmed by the Obj.Lascas Failure Learn A Big Lession From The Most Terrible Problems In The W. Vectorworks Activation Problem Free Vectors From The server connection options may have been set by your system administrator these should not be changed. std::vector and other std template things are resolved without errors. Presentation delivered to delegates of Vectorworks Distributor Conference.I had previously applied the " -std=c++11" fix to make modern C++ things like "unique_ptr" syntax work.I had the exact same symptoms that the OP reported: