Header file points to wrong package?

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Hi,

we have our own costmap package but didn't change the name of it.
So we have two costmap packages with the same name.

The problem is when opening with QTCreator, the include in costmap.cpp points me to the original installed header file.
But compiling is NO problem, although it shouldn't compile when really using the original header file! So QT has something wrong here.

Next thing is that when we want to compile a package that uses the costmap package, it fails because of undefined references in the costmap package. So now, the header file is really pointing to the original header file and not to ours.

Any hints on what we can do to point to the correct file?
A roscd costmap points me to our package.