Eclipse CDT complains about unresolved functions but still builds successfully

Question

The following C++ application compiles and runs successfully within Eclipse CDT but the IDE is still reporting an error stating:

Answer 1

Ok, if /usr/include is listed correctly, then go to preferences -> c/c++ -> Editor -> Indexer -> select Indexer

Sometimes change it from fast c/c++ indexer to the Full one resolves the problem.

Hope it helps