Hi,

GWL_USERDATA is defined as -21 in winuser.h.
Near the beginning of scintilla.xs, immediately following the line:

#include "./include/Scintilla.h"
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I would insert:

#ifndef GWL_USERDATA
#define GWL_USERDATA (-21)
#endif
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I don't think that insertion will create any problems. If it does, then we probably start to think that the GWL_USERDATA definition was skipped in the strawberry build for a very good reason.

Anyway, see how that goes - and if it fixes the problem, maybe ask the Strawberry developers (by posting to the strawberry mailing list) just how/why it is that their winuser.h definition of GWL_USERDATA is being skipped for Strawberry Perl.

Cheers,
Rob