JDK10 build on Win64 fails on `make images`

[Oleksandr Nikitin]

Hello,

I am trying to build JDK 10 + Epsilon GC on Windows by this guide:
http://openjdk.java.net/jeps/8174901

TLDR: configure seems to run fine, but the `make images` step fails with
the error:
No rule to make target `java.base-libs`

Full build log: https://gist.github.com/wizzard0/
ad8406ea1c2aea4bfe9faeda35a76dd0

I can build JDK 8 and 9 in this environment, so I assume it is configured
mostly correctly.
Never dabbled with any JDK sources before, so looking for any advice. I can
provide access to the machine if needed.

Machine: Windows 10 Pro x64, Windows SDK 7.1, Cygwin x64, bootstrap JDK
1.8u121 x64

Thanks in advance!

-- 
With best wishes, Oleksandr Nikitin

skype: wizzard0