Re: 64-bit build on Windows

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Leake <stephen_leake@stephe-leake.org>
> Date: Sun, 22 Jan 2017 11:50:59 -0600
> Cc: Óscar Fuentes <ofv@wanadoo.es>,
> 	Eli Zaretskii <eliz@gnu.org>, Emacs developers <emacs-devel@gnu.org>
> 
> I suggest nt/INSTALL.w64 include instructions for installing Imagemagick,
> and any other optional packages that can be installed from msys2 at this
> time. And also a list of optional packages that must be gotten
> elsewhere.

It already does:

  ** Download and install the necessary packages

  Run msys2_shell.bat in your MSYS2 directory and you will see a BASH window
  opened.

  In the BASH prompt, use the following command to install the necessary
  packages (you can copy and paste it into the shell with Shift + Insert):

    pacman -S base-devel \
    mingw-w64-x86_64-toolchain \
    mingw-w64-x86_64-xpm-nox \
    mingw-w64-x86_64-libtiff \
    mingw-w64-x86_64-giflib \
    mingw-w64-x86_64-libpng \
    mingw-w64-x86_64-libjpeg-turbo \
    mingw-w64-x86_64-librsvg \
    mingw-w64-x86_64-libxml2 \
    mingw-w64-x86_64-gnutls \
    mingw-w64-x86_64-zlib

  The packages include the base developer tools (autoconf, automake, grep, make,
  etc.), the compiler toolchain (gcc, gdb, etc.), several image libraries, an
  XML library, the GnuTLS (transport layer security) library, and zlib for
  decompressing text.  Only the first three packages are required (base-devel,
  toolchain, xpm-nox); the rest are optional.  You can select only part of the
  libraries if you don't need them all.

ImageMagick is not listed because the Windows build doesn't support it
yet.  All the other packages are (or should be) listed; if you think
something is missing, or the text below the list is unclear about
what's optional, please point out what should be
added/removed/modified.

> Currently, the list of packages to get from pacman lists some optional
> packages, but not all, so the statement "you now have a complete build
> environment for emacs" is misleading.

It is not meant to be misleading, it is meant to list everything.  And
I think it does.

> At the very least, there should somewhere be a _complete_ list of
> optional packages; INSTALL.w64 could reference that list, rather than
> repeat it.

The above is that complete list.

> One more point; under "run configure", it says installing Emacs to the
> default "C:\msys64" is "not recommended". Why not?

I don't know.  I suggest to ask the author.