pC++2dep: multiply defined symbols

Is there any way to get pC++2dep to accept some undefined symbols, rather
than crashing with an error message?

The reason I ask is that when I fully preprocess (with cpp) my source to get
rid of all the #includes, I find that my system include files (such as   
streambuf.h) have some constructs that pC++2dep doesn't like.  For example,
this should be legal, but I get an error message due to the double declaration
of 'open_mode', even though it is in a different scope:
enum open_mode {
    ... };

class ios : public _ios_fields {
    enum open_mode {

But in any case, I don't really need to preprocess so deeply that I see all
the system include files; I would rather just not expand the #include and leave
the stream primitives undefined.  Is there any way to do this with your system?