weird @include problem under Cygwin

[Per Bothner]

I'm testing building Kawa (including kawa.info) using Cygwin, and
ran into this puzzling problem:

$ makeinfo -I . -o kawa.info kawa.texi
kawa.texi:123: @include: could not find version.texi
kawa.texi:130: warning: undefined flag: UPDATED
...

Line 123 is:
@include version.texi

Makeinfo can read version.texi directly:

$ makeinfo -o dummy.info version.texi
version.texi: warning: document without nodes

I've tried replacing the '-I .' with an explicit path - both Windows-style
(-I 'C:\Users\Per\Kawa\doc') and Cygwin-style (-I /cygdrive/c/Users/Per/doc).

I've also tried unix2dos and dos2unix to see if CRLF vs LF is a factor.

makeinfo --version reports 5.2.

Does this ring a bell with anyone?  Does anyone have experience with
running the new makeinfo under Cygwin on a file with @include?
--
        --Per Bothner
address@hidden   http://per.bothner.com/