Write past chunk end?

I'm testing out the latest version of Palles ICU patch on win32, and I
got the build syste mworking. But it no longer works when built - it
used to...

When initdb:ing with this version and -E UNICODE, I get:
WARNING: detected write past chunk end in Analyze Column 01472ED0


Any ideas on how to debug this?

(The net result is that it sorts things in the wrong order, so things
are clearly broken..)

//Magnus