This allowed me to avoid Eclipse "Unresolved inclusion" error.
In my case I had to find the location of the C++ vector header on my computer (which is a Mac):
find /usr/local -name vector -print
I found the correct include location in folder "/usr/include/c++/4.2.1". Then I set my project eclipse settings like so:
Project->Properties->C/C++ General->Paths and Symbols->GNU C++->(Add)->"/usr/include/c++/4.2.1"
I'm not using C++ Builder, but my solution might address part of your trouble.
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