Help to write a port (of a plugin) to mingw

[4N]

Hi,

I've developed a plugin for Virtualdub and Avisynth under
VisualC++ 6 and Intel compiler 7.
Since Intel compiler was a trial version and for other reasons I'd like to port it under mingw.
I tried using "Bloodshed Dev-C++" but I obtained a lot of errors from internal.h,
and I don't know if there are problems with header files of virtualdub too.
Does someone know how to help me to get rid of this problem?

Thanks in advance.