On Mon 20 Aug 2018, Ken Brown wrote:

> On 8/17/2018 10:31 AM, Eli Zaretskii wrote:
>> branch: master
>> commit cc5325b0bea13bd93478fcee0b035877b3a72290
>> Author: Andy Moreton <andrewjmoreton@gmail.com>
>> Commit: Eli Zaretskii <eliz@gnu.org>
>>
>>      Pacify -Wcast-function-type warnings in GCC 8.1
>>           * src/w32.h: (get_proc_addr): New function.
>>      * src/w32fns.c (setup_w32_kbdhook, Ffile_system_info)
>>      * src/w32uniscribe.c (syms_of_w32uniscribe): Use get_proc_addr.
>
> This breaks the Cygwin-w32 build because w32fns.c and w32uniscribe.c don't
> include w32.h on Cygwin, so get_proc_addr is undefined.  Could the definition
> of get_proc_addr be moved to a different header that gets included in the
> Cygwin build?  Maybe w32common.h?

Sorry Ken, I forgot to test this Cygwin as well as mingw32 and mingw64.
Does something like this patch work for you ?

    AndyM