diff --git a/gnu/build/cross-toolchain.scm b/gnu/build/cross-toolchain.scm
index d430b8afc4..201b36ff7c 100644
--- a/gnu/build/cross-toolchain.scm
+++ b/gnu/build/cross-toolchain.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2016 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
+;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -95,7 +96,7 @@ C_INCLUDE_PATH et al."
      ;; We're building the sans-libc cross-compiler, so nothing to do.
      #t)))

-(define* (set-cross-path/mingw #:key inputs #:allow-other-keys)
+(define* (set-cross-path/mingw #:key inputs target #:allow-other-keys)
   "Add the cross MinGW headers to CROSS_C_*_INCLUDE_PATH, and remove them from
 C_*INCLUDE_PATH."
   (let ((libc (assoc-ref inputs "libc"))
@@ -112,7 +113,7 @@ C_*INCLUDE_PATH."

     (if libc
         (let ((cpath (string-append libc "/include"
-                                    ":" libc "/i686-w64-mingw32/include")))
+                                    ":" libc "/" target "/include")))
           (for-each (cut setenv <> cpath)
                     %gcc-cross-include-paths))

@@ -142,7 +143,7 @@ C_*INCLUDE_PATH."
     (when libc
       (setenv "CROSS_LIBRARY_PATH"
               (string-append libc "/lib"
-                             ":" libc "/i686-w64-mingw32/lib")))
+                             ":" libc "/" target "/lib")))

     (setenv "CPP" (string-append gcc "/bin/cpp"))
     (for-each (lambda (var)
@@ -168,8 +169,12 @@ C_*INCLUDE_PATH."
 a target triplet."
   (modify-phases phases
     (add-before 'configure 'set-cross-path
-      (if (string-contains target "mingw")
-          set-cross-path/mingw
+      ;; This mingw32 target checking logic should match that of target-mingw?
+      ;; in (guix utils), but (guix utils) is too large too copy over to the
+      ;; build side entirely and for now we have no way to select variables to
+      ;; copy over. See (gnu packages cross-base) for more details.
+      (if (string-suffix? "-mingw32" target)
+          (cut set-cross-path/mingw #:target target <...>)
           set-cross-path))
     (add-after 'install 'make-cross-binutils-visible
       (cut make-cross-binutils-visible #:target target <...>))
diff --git a/gnu/ci.scm b/gnu/ci.scm
index 4885870e16..aeebd4f14b 100644
--- a/gnu/ci.scm
+++ b/gnu/ci.scm
@@ -130,7 +130,8 @@ SYSTEM."
     "aarch64-linux-gnu"
     "powerpc-linux-gnu"
     "i586-pc-gnu"                                 ;aka. GNU/Hurd
-    "i686-w64-mingw32"))
+    "i686-w64-mingw32"
+    "x86_64-w64-mingw32"))

 (define %guixsd-supported-systems
   '("x86_64-linux" "i686-linux" "armhf-linux"))
diff --git a/gnu/packages/bootstrap.scm b/gnu/packages/bootstrap.scm
index 5030b815b9..cd99425379 100644
--- a/gnu/packages/bootstrap.scm
+++ b/gnu/packages/bootstrap.scm
@@ -2,6 +2,7 @@
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015, 2018 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
+;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -187,6 +188,7 @@ return value is ignored."
         ((string=? system "avr") "no-ld.so")
         ((string=? system "propeller-elf") "no-ld.so")
         ((string=? system "i686-mingw") "no-ld.so")
+        ((string=? system "x86_64-mingw") "no-ld.so")
         ((string=? system "vc4-elf") "no-ld.so")

         (else (error "dynamic linker name not known for this system"
diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index a0341ebc5d..e277139f25 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -4,6 +4,7 @@
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2016 Manolis Fragkiskos Ragkousis <manolis837@gmail.com>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -249,7 +250,7 @@ target that libc."
            (cond
             ((target-mingw? target)
              (if libc
-                 `(("libc" ,mingw-w64)
+                 `(("libc" ,libc)
                    ,@inputs)
                  `(("mingw-source" ,(package-source mingw-w64))
                    ,@inputs)))
@@ -509,7 +510,8 @@ and the cross tool chain."
                      #:optional
                      (libc glibc))
   (if (target-mingw? target)
-      mingw-w64
+      (let ((machine (substring target 0 (string-index target #\-))))
+        (make-mingw-w64 machine))
       libc))

 (define* (cross-newlib? target
diff --git a/gnu/packages/mingw.scm b/gnu/packages/mingw.scm
index 3e96f2c475..017f9453ab 100644
--- a/gnu/packages/mingw.scm
+++ b/gnu/packages/mingw.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2019 Carl Dong <contact@carldong.me>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -31,56 +32,56 @@
   #:use-module (guix utils)
   #:use-module (ice-9 match))

-(define %mingw-triplet
-  "i686-w64-mingw32")
-
-(define-public mingw-w64
-  (package
-    (name "mingw-w64")
-    (version "5.0.4")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "https://sourceforge.net/projects/mingw-w64/files/mingw-w64/"
-                    "mingw-w64-release/mingw-w64-v" version ".tar.bz2"))
-              (sha256
-               (base32 "00zq3z1hbzd5yzmskskjg79xrzwsqx7ihyprfaxy4hb897vf29sm"))
-              (patches (search-patches "mingw-w64-5.0rc2-gcc-4.9.3.patch"))))
-    (native-inputs `(("xgcc-core" ,(cross-gcc %mingw-triplet))
-                     ("xbinutils" ,(cross-binutils %mingw-triplet))))
-    (build-system gnu-build-system)
-    (search-paths
-     (list (search-path-specification
-            (variable "CROSS_C_INCLUDE_PATH")
-            (files '("include" "i686-w64-mingw32/include")))
-           (search-path-specification
-            (variable "CROSS_LIBRARY_PATH")
-            (files
-             '("lib" "lib64" "i686-w64-mingw32/lib" "i686-w64-mingw32/lib64")))))
-    (arguments
-     `(#:configure-flags '("--host=i686-w64-mingw32")
-       #:phases
-       (modify-phases %standard-phases
-         (add-before 'configure 'setenv
-           (lambda* (#:key inputs #:allow-other-keys)
-             (let ((xgcc-core (assoc-ref inputs "xgcc-core"))
-                   (mingw-headers (string-append (getcwd) "/mingw-w64-headers")))
-               (setenv "CPP"
-                       (string-append xgcc-core "/bin/i686-w64-mingw32-cpp"))
-               (setenv "CROSS_C_INCLUDE_PATH"
-                       (string-append
-                        mingw-headers
-                        ":" mingw-headers "/include"
-                        ":" mingw-headers "/crt"
-                        ":" mingw-headers "/defaults/include"
-                        ":" mingw-headers "/direct-x/include"))))))
-       #:make-flags (list "DEFS=-DHAVE_CONFIG_H -D__MINGW_HAS_DXSDK=1")
-       #:tests? #f ; compiles and includes glibc headers
-       #:strip-binaries? #f))
-    (home-page "https://mingw-w64.org")
-    (synopsis "Minimalist GNU for Windows")
-    (description
-     "Minimalist GNU for Windows (@dfn{MinGW}) is a complete software
+(define-public (make-mingw-w64 machine)
+  (let ((triplet (string-append machine "-" "w64-mingw32")))
+    (package
+      (name (string-append "mingw-w64" "-" machine))
+      (version "5.0.4")
+      (source (origin
+                (method url-fetch)
+                (uri (string-append
+                      "https://sourceforge.net/projects/mingw-w64/files/mingw-w64/"
+                      "mingw-w64-release/mingw-w64-v" version ".tar.bz2"))
+                (sha256
+                 (base32 "00zq3z1hbzd5yzmskskjg79xrzwsqx7ihyprfaxy4hb897vf29sm"))
+                (patches (search-patches "mingw-w64-5.0rc2-gcc-4.9.3.patch"))))
+      (native-inputs `(("xgcc-core" ,(cross-gcc triplet))
+                       ("xbinutils" ,(cross-binutils triplet))))
+      (build-system gnu-build-system)
+      (search-paths
+       (list (search-path-specification
+              (variable "CROSS_C_INCLUDE_PATH")
+              (files `("include" ,(string-append triplet "/include"))))
+             (search-path-specification
+              (variable "CROSS_LIBRARY_PATH")
+              (files
+               `("lib" "lib64"
+                 ,(string-append triplet "/lib")
+                 ,(string-append triplet "/lib64"))))))
+      (arguments
+       `(#:configure-flags '(,(string-append "--host=" triplet))
+         #:phases
+         (modify-phases %standard-phases
+           (add-before 'configure 'setenv
+             (lambda* (#:key inputs #:allow-other-keys)
+               (let ((xgcc-core (assoc-ref inputs "xgcc-core"))
+                     (mingw-headers (string-append (getcwd) "/mingw-w64-headers")))
+                 (setenv "CPP"
+                         (string-append xgcc-core ,(string-append "/bin/" triplet "-cpp")))
+                 (setenv "CROSS_C_INCLUDE_PATH"
+                         (string-append
+                          mingw-headers
+                          ":" mingw-headers "/include"
+                          ":" mingw-headers "/crt"
+                          ":" mingw-headers "/defaults/include"
+                          ":" mingw-headers "/direct-x/include"))))))
+         #:make-flags (list "DEFS=-DHAVE_CONFIG_H -D__MINGW_HAS_DXSDK=1")
+         #:tests? #f ; compiles and includes glibc headers
+         #:strip-binaries? #f))
+      (home-page "https://mingw-w64.org")
+      (synopsis "Minimalist GNU for Windows")
+      (description
+       "Minimalist GNU for Windows (@dfn{MinGW}) is a complete software
 development environment for creating native Microsoft Windows applications.

 It includes a set of Windows-specific header files and static import libraries
@@ -89,4 +90,12 @@ runtime dynamic-link libraries (@dfn{DLL}s).

 Mingw-w64 is an advancement of the original mingw.org project and provides
 several new APIs such as DirectX and DDK, and 64-bit support.")
-    (license license:fdl1.3+)))
+      (license license:fdl1.3+))))
+
+(define-public mingw-w64-i686
+  (make-mingw-w64 "i686"))
+
+(define-public mingw-w64-x86_64
+  (make-mingw-w64 "x86_64"))
+
+(define-public mingw-w64 mingw-w64-i686)
