diff --git a/gnu/packages/axoloti.scm b/gnu/packages/axoloti.scm
index e1e70baad5..18221dc4e3 100644
--- a/gnu/packages/axoloti.scm
+++ b/gnu/packages/axoloti.scm
@@ -32,6 +32,7 @@ (define-module (gnu packages axoloti)
   #:use-module (gnu packages embedded)
   #:use-module (gnu packages flashing-tools)
   #:use-module (gnu packages java)
+  #:use-module (gnu packages java-graphics)
   #:use-module (gnu packages libusb)
   #:use-module (gnu packages pkg-config)
   #:use-module (gnu packages textutils)
@@ -357,3 +358,276 @@ (define-public axoloti-patcher
 for sketching digital audio algorithms.  The patches run on a standalone
 powerful microcontroller board: Axoloti Core.  This package provides the
 patcher application.")))
+
+(define-public axoloti-patcher-next
+  (package
+    (name "axoloti-patcher-next")
+    (version "2.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/axoloti/axoloti.git")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "022p993wf9l9mp6vg94x592vfqd1k1sjrq5f6x45h5r16qy6bdzh"))
+       (modules '((guix build utils)))
+       (snippet
+        '(begin
+           ;; Remove pre-built Java binaries.
+           (delete-file-recursively "lib/")
+           #t))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:tests? #f ; there's a Java test which is run as part of the Java build.
+       #:modules ((guix build gnu-build-system)
+                  ((guix build ant-build-system) #:prefix ant:)
+                  (guix build utils)
+                  (srfi srfi-1)
+                  (srfi srfi-26)
+                  (ice-9 match)
+                  (ice-9 regex)
+                  (sxml simple)
+                  (sxml xpath)
+                  (sxml transform))
+       #:imported-modules ((guix build ant-build-system)
+                           (guix build syscalls)
+                           ,@%gnu-build-system-modules)
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'make-git-checkout-writable
+           (lambda* (#:key inputs #:allow-other-keys)
+             (copy-recursively (assoc-ref inputs "elfloader")
+                               "firmware/elfloader")
+             (for-each make-file-writable (find-files "."))
+             #t))
+         (add-after 'unpack 'patch-paths
+           (lambda* (#:key inputs #:allow-other-keys)
+             ;; prepare ChibiOS
+             (invoke "7z" "x" (assoc-ref inputs "chibios"))
+             (with-directory-excursion "ChibiOS_19.1.3/ext"
+               (invoke "7z" "x" "fatfs-0.13_patched.7z"))
+             #;
+             (substitute* "firmware/Makefile"
+               (("USE_COPT =") "USE_COPT = -std=gnu99"))
+
+             ;; Hardcode full path to compiler tools
+             (substitute*
+                 '("ChibiOS_19.1.3/os/common/startup/ARMCMx/compilers/GCC/mk/arm-none-eabi.mk"
+                   "env/arm-none-eabi.mk")
+               (("TRGT =.*")
+                (string-append "TRGT = "
+                               (assoc-ref inputs "cross-toolchain")
+                               "/bin/arm-none-eabi-\n")))
+
+             ;; Hardcode path to "make"
+             (substitute* "src/main/java/axoloti/shell/ShellTask.java"
+               (("return \"make\"")
+                (string-append "return \"" (which "make") "\"")))
+
+             ;; Hardcode path to "dfu-util"
+             (substitute* "src/main/java/axoloti/shell/UploadFirmwareDFU.java"
+               (("Axoloti.getReleaseDir\\(\\) \\+ \"/platform_.+/bin/dfu-util\"")
+                (string-append "\"" (which "dfu-util") "\"")))
+             #t))
+         (delete 'configure)
+         (replace 'build
+           ;; Build Axoloti firmware with cross-compiler
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let* ((toolchain (assoc-ref inputs "cross-toolchain"))
+                    (headers   (string-append
+                                toolchain
+                                "/arm-none-eabi/include:"
+                                toolchain
+                                "/arm-none-eabi/include/arm-none-eabi/armv7e-m")))
+               (setenv "CROSS_CPATH" headers)
+               (setenv "CROSS_CPLUS_INCLUDE_PATH" headers)
+               (setenv "CROSS_LIBRARY_PATH"
+                       (string-append toolchain
+                                      "/arm-none-eabi/lib")))
+             (with-directory-excursion "platform_linux"
+               (invoke "sh" "compile_firmware.sh"))))
+         (add-after 'build 'build-patcher
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (setenv "JAVA_HOME" (assoc-ref inputs "jdk"))
+             ;; We want to use our own jar files instead of the pre-built
+             ;; stuff in lib.  So we replace the zipfileset tags in the
+             ;; build.xml with new ones that reference our jars.
+             (let* ((build.xml (with-input-from-file "build.xml"
+                                 (lambda _
+                                   (xml->sxml #:trim-whitespace? #t))))
+                    (jars      (append-map (match-lambda
+                                             (((? (cut string-prefix? "java-" <>)
+                                                  label) . directory)
+                                              (find-files directory "\\.jar$"))
+                                             (_ '()))
+                                           inputs))
+                    (classpath (string-join jars ":"))
+                    (fileset   (map (lambda (jar)
+                                      `(zipfileset (@ (excludes "META-INF/*.SF")
+                                                      (src ,jar))))
+                                    jars)))
+               (call-with-output-file "build.xml"
+                 (lambda (port)
+                   (sxml->xml
+                    (pre-post-order
+                     build.xml
+                     `( ;; Remove all zipfileset tags from the "jar" tree and
+                       ;; inject our own tags.
+                       (jar . ,(lambda (tag . kids)
+                                 `(jar ,@(append-map
+                                          (filter (lambda (e)
+                                                    (not (eq? 'zipfileset (car e)))))
+                                          kids)
+                                       ,@fileset)))
+                       ;; Skip the "bundle" target (and the "-post-jar" target
+                       ;; that depends on it), because we don't need it and it
+                       ;; confuses sxml->xml.
+                       (target . ,(lambda (tag . kids)
+                                    (let ((name ((sxpath '(name *text*))
+                                                 (car kids))))
+                                      (if (or (member "bundle" name)
+                                              (member "-post-jar" name))
+                                          '() ; skip
+                                          `(,tag ,@kids)))))
+                       (*default*  . ,(lambda (tag . kids) `(,tag ,@kids)))
+                       (*text*     . ,(lambda (_ txt)
+                                        (match txt
+                                          ;; Remove timestamp.
+                                          ("${TODAY}" "(unknown)")
+                                          (_ txt))))))
+                    port)))
+
+               ;; Build it!
+               (invoke "ant"
+                       (string-append "-Djavac.classpath=" classpath)
+                       "-Dbuilt_by=guix"
+                       "-Dbuild.time=01/01/1970 00:00:00"
+                       "-Djavac.source=1.8"
+                       "-Djavac.target=1.8"
+                       (string-append "-Dshort.version="
+                                      ,version)
+                       ;; TODO: this is the output of:
+                       ;; git describe --long --tags --dirty --always
+                       (string-append "-Dbuild.version="
+                                      ,version "-0-g88b60feb")))))
+         (replace 'install
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (let* ((out   (assoc-ref outputs "out"))
+                    (share (string-append out "/share/axoloti/")))
+
+               ;; TODO: don't copy *everything* from these directories.
+               (for-each (lambda (dir)
+                           (copy-recursively dir (string-append share "/" dir)))
+                         '("api"
+                           "archive"
+                           "doc"
+                           "env"
+                           "firmware"
+                           "nbproject"
+                           "platform_linux"))
+               (install-file "dist/Axoloti.jar" share)
+
+               ;; Install old firmware
+               (let ((target (string-append share "/old_firmware/"))
+                     (old-firmware
+                      (string-append (assoc-ref inputs "axoloti-runtime")
+                                     "/share/axoloti/firmware/")))
+                 (mkdir-p target)
+                 (install-file (string-append old-firmware
+                                              "flasher/flasher_build/flasher.bin")
+                               target)
+                 ;; TODO: the old file differs from the file that is included
+                 ;; in this repository as the old firmware.
+                 (install-file (string-append old-firmware
+                                              "build/axoloti.bin")
+                               target))
+
+               ;; We do this to ensure that this package retains references to
+               ;; other Java packages' jar files.
+               (install-file "build.xml" share)
+
+               ;; Create a launcher script
+               (mkdir (string-append out "/bin"))
+               (let ((target (string-append out "/bin/Axoloti")))
+                 (with-output-to-file target
+                   (lambda ()
+                     (let* ((dir       (string-append (assoc-ref outputs "out")
+                                                      "/share/axoloti"))
+                            (toolchain (assoc-ref inputs "cross-toolchain"))
+                            (includes  (string-append
+                                        toolchain
+                                        "/arm-none-eabi/include:"
+                                        toolchain
+                                        "/arm-none-eabi/include/arm-none-eabi/armv7e-m")))
+                       (display
+                        (string-append "#!" (which "sh") "\n"
+                                       "export CROSS_CPATH=" includes "\n"
+                                       "export CROSS_CPLUS_INCLUDE_PATH=" includes "\n"
+                                       "export CROSS_LIBRARY_PATH="
+                                       toolchain "/arm-none-eabi/lib" "\n"
+                                       (which "java")
+
+                                       ;; Renderer arguments
+                                       " -Xbootclasspath/a:"
+                                       (assoc-ref inputs "java-marlin-renderer")
+                                       "/lib/marlin.jar"
+                                       " -Dsun.java2d.renderer=org.marlin.pisces.MarlinRenderingEngine"
+                                       " -Daxoloti_release=" share
+                                       " -jar " dir "/Axoloti.jar")))))
+                 (chmod target #o555))
+               #t)))
+         (add-after 'install 'strip-jar-timestamps
+           (assoc-ref ant:%standard-phases 'strip-jar-timestamps)))))
+    (inputs
+     `(("jdk" ,icedtea "jdk")
+       ("cross-toolchain" ,arm-none-eabi-nano-toolchain-7-2018-q2-update)
+       ;; for compiling patches
+       ("make" ,gnu-make)
+       ;; for uploading compiled patches and firmware
+       ("dfu-util" ,dfu-util-for-axoloti)
+       ;; for org/apache/commons/lang3/tuple/ImmutablePair
+       ("java-commons-lang3" ,java-commons-lang3)
+       ("java-jgit" ,java-jgit-4.2)
+       ("java-jsch" ,java-jsch)
+       ("java-marlin-renderer" ,java-marlin-renderer)
+       ("java-piccolo2d-core" ,java-piccolo2d-core)
+       ("java-piccolo2d-extras" ,java-piccolo2d-extras)
+       ("java-rsyntaxtextarea" ,java-rsyntaxtextarea)
+       ("java-simple-xml" ,java-simple-xml)
+       ("java-slf4j-api" ,java-slf4j-api)
+       ("java-usb4java" ,java-usb4java)))
+    (native-inputs
+     `(("ant" ,ant)
+       ("axoloti-runtime" ,axoloti-runtime) ; for old firmware
+       ("java-junit" ,java-junit)
+       ("java-hamcrest-core" ,java-hamcrest-core)
+       ("p7zip" ,p7zip)
+       ("zip" ,zip)                     ; for repacking the jar
+       ("elfloader"
+        ,(let ((commit "d0f93acac6577a069b8739bf42c9500e9a862988"))
+           (origin
+             (method git-fetch)
+             (uri (git-reference
+                   (url "https://github.com/JohannesTaelman/elfloader.git")
+                   (commit commit)))
+             (file-name (git-file-name "elfloader" commit))
+             (sha256
+              (base32
+               "0zsy6w784amfq4vr1qnx8xvy70v33gvffz1vljllwppdc8s3khmn")))))
+       ("chibios"
+        ,(origin
+           (method url-fetch)
+           (uri "http://rwthaachen.dl.osdn.jp/chibios/70739/ChibiOS_19.1.3.7z")
+           (sha256
+            (base32
+             "1090alqp1z1bhj1z8ls04a350kbs8hsjcpkfddbprds73zbnnpk9"))))))
+    (home-page "http://www.axoloti.com/")
+    (synopsis "Audio development environment for the Axoloti core board")
+    (description
+     "The Axoloti patcher offers a “patcher” environment similar to Pure Data
+for sketching digital audio algorithms.  The patches run on a standalone
+powerful microcontroller board: Axoloti Core.")
+    (license (list license:gpl3+     ; the whole project and GUI
+                   license:bsd-3)))) ; the elfloader