make check fails in [build JCS]

[Noel Grandin]

On 2018/08/29 11:06 AM, Stephan Bergmann wrote:
> investigating deeper into the issue.  (Apparently, Java no longer accepts file:... URLs there, at least on Windows, and 
> won't accept full pathnames starting with a drive letter like C:/..., but does accept ("drive-absolute") pathnames like 
> /...; so my hack should work as long as your files are on drive C.)
> 

That probably needs whatever magic will convert a cygwin path into a DOS/NT path i.e. something starting with

    C:\

(note the backslash instead of a forwardslash)