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diff --git a/admin/nt/dist-build/build-dep-zips.py b/admin/nt/dist-build/build-dep-zips.py
new file mode 100755
index 00000000000..33bc4b586c9
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+++ b/admin/nt/dist-build/build-dep-zips.py
@@ -0,0 +1,223 @@
+#!/usr/bin/python3
+
+## Copyright (C) 2017 Free Software Foundation, Inc.
+
+## This file is part of GNU Emacs.
+
+## GNU Emacs is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+
+## GNU Emacs is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+## You should have received a copy of the GNU General Public License
+## along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+import argparse
+import multiprocessing as mp
+import glob
+import os
+import shutil
+import re
+
+from subprocess import check_output
+
+## Constants
+EMACS_MAJOR_VERSION="26"
+
+
+## Options
+DRY_RUN=False
+
+## Packages to fiddle with
+SKIP_PKGS=["mingw-w64-gcc-libs"]
+MUNGE_PKGS ={"mingw-w64-libwinpthread-git":"mingw-w64-winpthreads-git"}
+ARCH_PKGS=["mingw-w64-mpc",
+           "mingw-w64-termcap",
+           "mingw-w64-xpm-nox"]
+SRC_REPO="https://sourceforge.net/projects/msys2/files/REPOS/MINGW/Sources"
+
+
+def check_output_maybe(*args,**kwargs):
+    if(DRY_RUN):
+        print("Calling: {}{}".format(args,kwargs))
+    else:
+        return check_output(*args,**kwargs)
+
+def extract_deps():
+
+    # This list derives from the features we want Emacs to compile with.
+    PKG_REQ='''mingw-w64-x86_64-giflib
+mingw-w64-x86_64-gnutls
+mingw-w64-x86_64-libjpeg-turbo
+mingw-w64-x86_64-libpng
+mingw-w64-x86_64-librsvg
+mingw-w64-x86_64-libtiff
+mingw-w64-x86_64-libxml2
+mingw-w64-x86_64-xpm-nox
+mingw-w64-x86_64-lcms2'''.split()
+
+    # Get a list of all dependencies needed for packages mentioned above.
+    # Run `pactree -lu' for each elment of $PKG_REQ
+    pkgs = set()
+    for x in PKG_REQ:
+        pkgs.update(
+            check_output(["pactree", "-lu", x]).decode("utf-8").split()
+        )
+
+    return sorted(pkgs)
+
+def gather_deps(deps, arch, directory):
+
+    os.mkdir(arch)
+    os.chdir(arch)
+
+    ## Replace the architecture with the correct one
+    deps = [re.sub(r"x86_64",arch,x) for x in deps]
+
+    ## find all files the transitive dependencies
+    deps_files = check_output(
+        ["pacman", "-Ql"] + deps
+    ).decode("utf-8").split("\n")
+
+    ## Produces output like
+    ## mingw-w64-x86_64-zlib /mingw64/lib/libminizip.a
+
+    ## drop the package name
+    tmp = deps_files.copy()
+    deps_files=[]
+    for d in tmp:
+        slt = d.split()
+        if(not slt==[]):
+            deps_files.append(slt[1])
+
+    ## sort uniq
+    deps_files = sorted(list(set(deps_files)))
+    ## copy all files into local
+    print("Copying dependencies: {}".format(arch))
+    check_output_maybe(["rsync", "-R"] + deps_files + ["."])
+
+    ## And package them up
+    os.chdir(directory)
+    print("Zipping: {}".format(arch))
+    check_output_maybe("zip -9r ../../emacs-26-{}-deps.zip *".format(arch),
+                       shell=True)
+    os.chdir("../../")
+
+
+def download_source(tarball):
+    print("Downloading {}...".format(tarball))
+    check_output_maybe(
+        "wget -a ../download.log -O {} {}/{}/download"
+        .format(tarball, SRC_REPO, tarball),
+        shell=True
+    )
+    print("Downloading {}... done".format(tarball))
+
+def gather_source(deps):
+
+
+    ## Source for gcc-libs is part of gcc
+    ## Source for libwinpthread is in libwinpthreads
+    ## mpc, termcap, xpm -- has x86_64, and i686 versions
+
+    ## This needs to have been run first at the same time as the
+    ## system was udpated.
+    os.mkdir("emacs-src")
+    os.chdir("emacs-src")
+
+    to_download = []
+    for pkg in deps:
+        pkg_name_and_version= \
+            check_output(["pacman","-Q", pkg]).decode("utf-8").strip()
+
+        ## Produces output like:
+        ## mingw-w64-x86_64-zlib 2.43.2
+        pkg_name_components = pkg_name_and_version.split()
+        pkg_name=pkg_name_components[0]
+        pkg_version=pkg_name_components[1]
+
+        ## make a simple name to make lookup easier
+        simple_pkg_name = re.sub(r"x86_64-","",pkg_name)
+
+        if(simple_pkg_name in SKIP_PKGS):
+            continue
+
+        ## Some packages have different source files for different
+        ## architectures. For these we need two downloads.
+        if(simple_pkg_name in ARCH_PKGS):
+            downloads = [pkg_name,
+                         re.sub(r"x86_64","i686",pkg_name)]
+        else:
+            downloads = [simple_pkg_name]
+
+        for d in downloads:
+            ## Switch names if necessary
+            d = MUNGE_PKGS.get(d,d)
+
+            tarball = "{}-{}.src.tar.gz".format(d,pkg_version)
+
+            to_download.append(tarball)
+
+    ## Download in parallel or it is just too slow
+    p = mp.Pool(16)
+    p.map(download_source,to_download)
+
+    print("Zipping")
+    check_output_maybe("zip -9 ../emacs-{}-deps-mingw-w64-src.zip *"
+                       .format(EMACS_MAJOR_VERSION),
+                       shell=True)
+
+    os.chdir("..")
+
+
+def clean():
+    print("Cleaning")
+    os.path.isdir("emacs-src") and shutil.rmtree("emacs-src")
+    os.path.isdir("i686") and shutil.rmtree("i686")
+    os.path.isdir("x86_64") and shutil.rmtree("x86_64")
+    os.path.isfile("download.log") and os.remove("download.log")
+
+
+if(os.environ["MSYSTEM"] != "MSYS"):
+    print("Run this script in an MSYS-shell!")
+    exit(1)
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument("-t", help="32 bit deps only",
+                    action="store_true")
+
+parser.add_argument("-f", help="64 bit deps only",
+                    action="store_true")
+
+parser.add_argument("-s", help="source code only",
+                    action="store_true")
+
+parser.add_argument("-c", help="clean only",
+                    action="store_true")
+
+parser.add_argument("-d", help="dry run",
+                    action="store_true")
+
+args = parser.parse_args()
+do_all=not (args.c or args.s or args.f or args.t)
+
+deps=extract_deps()
+
+DRY_RUN=args.d
+
+if( do_all or args.t ):
+    gather_deps(deps,"i686","mingw32")
+
+if( do_all or args.f ):
+    gather_deps(deps,"x86_64","mingw64")
+
+if( do_all or args.s ):
+    gather_source(deps)
+
+if( args.c ):
+    clean()