Reverting to gettext 0.18.1 didn't seem to help, and looks like the error is the same.
By the way, here is the complete build log [on my gentoo machine]. It's a shame i didn't get an idea to attach it earlier

I also replaced my build directory with some "~" to protect my anonymousness; i hope it'd be unambigious.
The problem seems to be 100% reproducible: I unpack the tarball, run the "./configure && make && make -Cpo update-po && make distclean" command as suggested, then run win32/__BUILD_SCRIPT > /some/other/dir/build1.txt 2>&1 and here's what i get (after sed'ing out the private data) (i also didn't modify the gettext file this time):
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