David Abrahams wrote: <snip>

...

Thanks for the tips but how do i go about "..preprocessing your code and looking for suspicious #includes."? I never debugged the preprocess level before.

Invoke your compiler with -E instead of -c (or /E instead of /c) and look at the #include lines for the names of old-style headers.

There are no #include directives in preprocessor output. There may be #line directives or similar lines stating filenames though.