bug#21590: 25.0.50; MS-Windows; fns.c:4863:21: error: 'MD5_DIGEST_SIZE' undeclared (first use in this function)

[Keith David Bershatsky]

I tracked down another build discrepancy this evening relating to a failure to 
find `iconv.h`.  It is caused because the default new installation of MinGW 
comes with a later version of libiconv than used by ezwinports.  I am pretty 
certain the error comes about when adding `cairo-1.12.16-w32-bin.zip` from 
ezwinports for the purposes mentioned in the `.../emacs/nt/INSTALL` readme 
file.  It might be caused by adding `p11-kit-0.9-w32-bin.zip` or 
`pkg-config-0.28-w32-bin.zip`, but I don't think so.  I have run so many builds 
recently, it's hard to keep track.

I think the process of installing packages with MingGW has changed since the 
early days when the `.../emacs/nt/INSTALL` was written.  There are references 
on the internet about placing the archives into the main root MinGW directory 
and they will supposedly be recognized automatically; however, the current 
installer seems to be using `C:\mingw\var\cache\mingw-get\packages` for storing 
the default repositories.  Placing the ezwinports dependencies into the MinGW 
root directory or the latter packages directory is insufficient for the old 
libiconv to be seen as an available install in the graphical installation 
utility for MinGW.  After a ton of Googles, I came up with the following to 
remove the repository default of 1.14-3 and replace it with the older version:

c:\mingw\bin\mingw-get remove mingw32-libiconv

c:\mingw\bin\mingw-get install "libiconv=1.13.1-1"

The result is that the Emacs build no longer fails for failure to find 
`iconv.h`.

I'm not sure how the issue above should be dealt with, but it certainly was 
time consuming tracking it down.


On a different note, I haven't been able to configure `guntls` so that it shows 
up automatically as an available "yes" Emacs install following a plain 
`./configure --prefix=/my/path`.  I have extracted all of the following from 
ezwinports to the MinGW root:

gnutls-3.3.11-w32-bin.zip
p11-kit-0.9-w32-bin.zip
pkg-config-0.28-w32-bin.zip
gdk-pixbuf-2.30.2-w32-bin.zip
giflib-5.1.0-w32-bin.zip
glib-2.38.2-w32-bin.zip
jpeg-v9a-w32-bin.zip
libpng-1.6.12-w32-bin.zip
librsvg-2.40.1-2-w32-bin.zip
libxml2-2.7.8-w32-bin.zip
tiff-4.0.3-w32-bin.zip
zlib-1.2.8-2-w32-bin.zip
libXpm-3.5.11-w32-bin.zip
cairo-1.12.16-w32-bin.zip

Any ideas on how to make the guntls option show up as `yes` when running 
`./configure` would be greatly appreciated.  Perhaps it's another dependency 
issue where something in MinGW is newer and needs to be downgraded?

Thanks,

Keith