Building Valhalla/JDK9 on Windows

[Stephen Colebourne]

I have just tried building both Valhalla and JDK9 on Windows and failed
with the following error during "bash configure":
https://java.net/projects/adoptopenjdk/pages/BuildWindows

bash configure --with-freetype-src=c:/apps/freetype

...
checking if fixpath can be created... yes
checking if fixpath.exe works... no
Microsoft (R) C/C++ Optimizing Compiler Version 16.00.40219.01 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

fixpath.c
c1 : fatal error C1083: Cannot open source file:
'c:/Users/stephen/.babun/cygwin/e/dev/valhalla/jdk9/common/src/fixpath.c':
No such file or directory
configure: error: fixpath did not work!


Using Babun shell
Windows 7 Professional
Have previously successfully compiled OpenJDK (not recently), so have
freetype and compilers

While it is possible that I might have out of date compilers/freetype, the
error I'm getting doesn't seem related to anything out of date.

Any suggestions?
Stephen