> I installed inkscape and tried running the .exe.  It returns to shell prompt but
> its exit code is 127, indicating a problem starting the process up.  ldd doesn't
> show anything amiss; as an aside that's an unusually long list of DLLs.
>
> I ran 'strace -o inkscape.out inkscape -V' and looked at the traced output.
> It ends with:
>
> --- Process 11940 (pid: 11940), exception c0000139 at 00007ffaecf324f6
> --- Process 11940 (pid: 11940) thread 1172 exited with status 0xc0000139
> --- Process 11940 (pid: 11940) thread 1888 exited with status 0xc0000139
> --- Process 11940 (pid: 11940) thread 5544 exited with status 0xc0000139> --- Process 11940 (pid: 11940) exited with status 0xc0000139
>
> I grep'd /usr/include/w32api/ntstatus.h for that status and got:
> #define STATUS_ENTRYPOINT_NOT_FOUND ((NTSTATUS)0xC0000139)
>
> I then tried running inkscape.exe from a Command Prompt window and got a popup:
> "The procedure entry point g_cclosure_marshal_VOID__BOOLEAN could not be located
> in the dynamic link library C:\cygwin64\bin\inkscape.exe."

> Why this happens, I leave to somebody experienced with building inkscape itself.
> HTH,
> 
> ..mark
I get those same error codes (of course the process ID and thread numbers are different).exception 139 indicates, I think, a missing required file or link. Maybe it's an issue with the cygwin64 installer (setup-x86_64.exe) not including all the necessary files? 
The exception occurs at 00007ffaecf324f6 on both our traces, so I grep'd it and that address only occurs in that line, so it's no help (at least not to me) trying to identify what program could be missing.
This is the list I found of required packages for inkscape:   
   - curl.
   - openssh.
   - openssl (Net)
   - php.
   - php-curl.
   - php-json.
   - php-phar (PHP)

curl and php (all four) weren't installed. I installed them and made sure openssh and openssl were the most recent versions.
Sadly, I get the exact same error list at the end of the strace output.
I'll go through the list of dependencies on the inkscape package summary page. Hopefully it's something in that list that didn't get installed by the updater.
Thanks for the guidance. John