diff --git a/tribes/packages/mix.scm b/tribes/packages/mix.scm
index 9b06821..f8720aa 100644
--- a/tribes/packages/mix.scm
+++ b/tribes/packages/mix.scm
@@ -1,7 +1,9 @@
 (define-module (tribes packages mix)
   #:use-module (guix base32)
+  #:use-module (guix build-system trivial)
   #:use-module (guix gexp)
   #:use-module (guix packages)
+  #:use-module (guix utils)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages bash)
   #:use-module (gnu packages base)
@@ -9,7 +11,8 @@
   #:use-module (gnu packages nss)
   #:use-module (gnu packages version-control)
   #:use-module (tribes packages otp)
-  #:export (fetch-mix-deps))
+  #:export (fetch-mix-deps
+            mix-release-package))
 
 (define* (fetch-mix-deps source
                          #:key
@@ -103,3 +106,174 @@ SOURCE according to mix.lock."
      #:recursive? #t
      #:leaked-env-vars ("http_proxy" "https_proxy"
                         "LC_ALL" "LC_MESSAGES" "LANG" "COLUMNS"))))
+
+(define* (mix-release-package source
+                              #:key
+                              mix-fod-deps
+                              name
+                              version
+                              home-page
+                              synopsis
+                              description
+                              license
+                              (native-inputs '())
+                              (inputs '())
+                              (path-inputs '())
+                              (aclocal-inputs '())
+                              (mix-env "prod")
+                              (mix-target "host")
+                              (compile-flags '())
+                              (mix-release-name "")
+                              (remove-cookie? #t)
+                              (setup-gexp #~(begin))
+                              (configure-gexp #f)
+                              (build-gexp #f)
+                              (install-gexp #f))
+  "Return a package that builds SOURCE as an offline Mix release using
+MIX-FOD-DEPS as a pre-fetched dependency tree."
+  (let* ((extra-path-dirs (map (lambda (input)
+                                 (file-append input "/bin"))
+                               path-inputs))
+         (aclocal-dirs (map (lambda (input)
+                              (file-append input "/share/aclocal"))
+                            aclocal-inputs))
+         (default-configure-gexp
+           #~(invoke "mix" "deps.compile" "--no-deps-check"
+                     "--skip-umbrella-children"))
+         (default-build-gexp
+           #~(invoke "mix" "compile" "--no-deps-check" #$@compile-flags))
+         (default-install-gexp
+           (if (string=? mix-release-name "")
+               #~(invoke "mix" "release" "--no-deps-check" "--path" out)
+               #~(invoke "mix" "release" #$mix-release-name
+                         "--no-deps-check" "--path" out)))
+         (configure-gexp (or configure-gexp default-configure-gexp))
+         (build-gexp (or build-gexp default-build-gexp))
+         (install-gexp (or install-gexp default-install-gexp))
+         (builder-gexp
+          #~(begin
+              (use-modules (guix build utils))
+
+              (define out #$output)
+              (define work (string-append (getcwd) "/build"))
+              (define app-dir (string-append work "/app"))
+              (define deps-dir (string-append app-dir "/deps"))
+              (define certs-dir
+                #$(file-append nss-certs "/etc/ssl/certs"))
+              (define cert-file
+                (string-append work "/ca-certificates.crt"))
+              (define hex-lib-dir
+                #$(file-append elixir-hex-otp28
+                               "/lib/elixir/"
+                               (version-major+minor
+                                (package-version elixir-otp28))))
+              (define aclocal-path
+                (string-join (list #$@aclocal-dirs) ":"))
+              (define path
+                (string-join
+                 (list #$(file-append elixir-otp28 "/bin")
+                       #$(file-append elixir-hex-otp28 "/bin")
+                       #$(file-append rebar3 "/bin")
+                       #$(file-append bash-minimal "/bin")
+                       #$(file-append coreutils "/bin")
+                       #$(file-append findutils "/bin")
+                       #$(file-append git-minimal "/bin")
+                       #$@extra-path-dirs
+                       (or (getenv "PATH") ""))
+                 ":"))
+
+              (mkdir-p work)
+              (copy-recursively #+source app-dir #:follow-symlinks? #t)
+              (invoke #$(file-append coreutils "/bin/chmod") "-R" "u+w" app-dir)
+              #$@(if mix-fod-deps
+                     (list
+                      #~(begin
+                          (copy-recursively #+mix-fod-deps deps-dir
+                                            #:follow-symlinks? #t)
+                          (invoke #$(file-append coreutils "/bin/chmod")
+                                  "-R" "u+w" deps-dir)))
+                     '())
+              (invoke #$(file-append bash-minimal "/bin/sh")
+                      "-c"
+                      (string-append
+                       #$(file-append coreutils "/bin/cat")
+                       " "
+                       certs-dir
+                       "/*.pem > "
+                       cert-file))
+
+              (setenv "PATH" path)
+              (setenv "HOME" (string-append app-dir "/.home"))
+              (setenv "MIX_HOME" (string-append app-dir "/.mix-home"))
+              (setenv "HEX_HOME" (string-append app-dir "/.hex"))
+              (setenv "XDG_CACHE_HOME" (string-append app-dir "/.cache"))
+              (setenv "MIX_ENV" #$mix-env)
+              (setenv "MIX_TARGET" #$mix-target)
+              (setenv "MIX_OS_CONCURRENCY_LOCK" "0")
+              (setenv "HEX_OFFLINE" "1")
+              (setenv "MIX_REBAR" #$(file-append rebar3 "/bin/rebar3"))
+              (setenv "MIX_REBAR3" #$(file-append rebar3 "/bin/rebar3"))
+              (setenv "REBAR_GLOBAL_CONFIG_DIR" (string-append work "/rebar3"))
+              (setenv "REBAR_CACHE_DIR" (string-append work "/rebar3.cache"))
+              (setenv "SHELL" #$(file-append bash-minimal "/bin/sh"))
+              (setenv "CONFIG_SHELL" #$(file-append bash-minimal "/bin/sh"))
+              (setenv "SSL_CERT_DIR" certs-dir)
+              (setenv "SSL_CERT_FILE" cert-file)
+              (setenv "HEX_CACERTS_PATH" cert-file)
+              (setenv "HEX_HTTP_CONCURRENCY" "1")
+              (setenv "HEX_HTTP_TIMEOUT" "120")
+              (setenv "LANG" "C.UTF-8")
+              (setenv "LC_CTYPE" "C.UTF-8")
+              (setenv "ELIXIR_ERL_OPTIONS" "+fnu")
+              (when (positive? (string-length aclocal-path))
+                (setenv "ACLOCAL_PATH" aclocal-path))
+              (let ((existing-elixir-libs (getenv "GUIX_ELIXIR_LIBS")))
+                (setenv "GUIX_ELIXIR_LIBS"
+                        (if existing-elixir-libs
+                            (string-append hex-lib-dir ":" existing-elixir-libs)
+                            hex-lib-dir)))
+              #$@(if mix-fod-deps
+                     (list #~(setenv "MIX_DEPS_PATH" deps-dir))
+                     '())
+              (mkdir-p (getenv "HOME"))
+              (mkdir-p (getenv "MIX_HOME"))
+              (mkdir-p (getenv "HEX_HOME"))
+              (mkdir-p (getenv "XDG_CACHE_HOME"))
+
+              #$setup-gexp
+
+              (with-directory-excursion app-dir
+                #$configure-gexp
+                #$build-gexp
+                #$install-gexp)
+
+              (let ((cookie (string-append out "/releases/COOKIE")))
+                (when (and #$remove-cookie?
+                           (file-exists? cookie))
+                  (delete-file cookie)))))
+         (package-arguments
+          (list
+           #:modules '((guix build utils))
+           #:builder builder-gexp)))
+    (package
+      (name name)
+      (version version)
+      (source source)
+      (build-system trivial-build-system)
+      (native-inputs
+       (append
+        (list bash-minimal
+              coreutils
+              findutils
+              git-minimal
+              nss-certs
+              rebar3
+              elixir-otp28
+              elixir-hex-otp28)
+        native-inputs))
+      (inputs inputs)
+      (arguments package-arguments)
+      (home-page home-page)
+      (synopsis synopsis)
+      (description description)
+      (license license))))
diff --git a/tribes/packages/source.scm b/tribes/packages/source.scm
index d86dfc6..dfd60e5 100644
--- a/tribes/packages/source.scm
+++ b/tribes/packages/source.scm
@@ -1,26 +1,19 @@
 (define-module (tribes packages source)
   #:use-module ((guix licenses) #:prefix license:)
-  #:use-module (guix build-system trivial)
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (guix gexp)
   #:use-module (guix packages)
   #:use-module (guix utils)
-  #:use-module (gnu packages admin)
   #:use-module (gnu packages autotools)
-  #:use-module (gnu packages bash)
   #:use-module (gnu packages base)
   #:use-module (gnu packages commencement)
-  #:use-module (gnu packages erlang)
   #:use-module (gnu packages gawk)
   #:use-module (gnu packages linux)
   #:use-module (gnu packages m4)
-  #:use-module (gnu packages nss)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
-  #:use-module (gnu packages version-control)
   #:use-module ((tribes packages mix) #:prefix mix:)
-  #:use-module (tribes packages otp)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-13)
   #:export (fetch-mix-deps
@@ -186,169 +179,79 @@ using MIX-DEPS as the pre-fetched Mix dependency tree resolved from mix.lock."
                               #:name (string-append name "-mix-deps")
                               #:version version
                               #:sha256 mix-deps-sha256))))
-    (package
-      (name name)
-      (version version)
-      (source source)
-      (build-system trivial-build-system)
-      (native-inputs
-       (list autoconf
-             autoconf-wrapper
-             automake
-             bash-minimal
-             coreutils
-             elixir-otp28
-             elixir-hex-otp28
-             findutils
-             gcc-toolchain
-             gawk
-             git-minimal
-             grep
-             gnu-make
-             libtool
-             linux-libre-headers
-             m4
-             nss-certs
-             perl
-             pkg-config
-             sed
-             rebar3))
-      (arguments
-       (list
-        #:modules '((guix build utils))
-        #:builder
-        #~(begin
-            (use-modules (guix build utils))
-
-            (define out #$output)
-            (define work (string-append (getcwd) "/build"))
-            (define app-dir (string-append work "/tribes"))
-            (define deps-dir (string-append app-dir "/deps"))
-            (define certs-dir
-              #$(file-append nss-certs "/etc/ssl/certs"))
-            (define cert-file
-              (string-append work "/ca-certificates.crt"))
-            (define hex-lib-dir
-              #$(file-append elixir-hex-otp28
-                             "/lib/elixir/"
-                             (version-major+minor
-                              (package-version elixir-otp28))))
-            (define aclocal-path
-              (string-join
-               (list #$(file-append automake "/share/aclocal")
-                     #$(file-append libtool "/share/aclocal"))
-               ":"))
-            (define kernel-headers-dir
-              #$(file-append linux-libre-headers "/include"))
-            (define path
-              (string-join
-               (list #$(file-append elixir-otp28 "/bin")
-                     #$(file-append elixir-hex-otp28 "/bin")
-                     #$(file-append rebar3 "/bin")
-                     #$(file-append gcc-toolchain "/bin")
-                     #$(file-append gnu-make "/bin")
-                     #$(file-append autoconf-wrapper "/bin")
-                     #$(file-append autoconf "/bin")
-                     #$(file-append automake "/bin")
-                     #$(file-append bash-minimal "/bin")
-                     #$(file-append coreutils "/bin")
-                     #$(file-append findutils "/bin")
-                     #$(file-append libtool "/bin")
-                     #$(file-append gawk "/bin")
-                     #$(file-append grep "/bin")
-                     #$(file-append m4 "/bin")
-                     #$(file-append perl "/bin")
-                     #$(file-append pkg-config "/bin")
-                     #$(file-append sed "/bin")
-                     #$(file-append git-minimal "/bin")
-                     (or (getenv "PATH") ""))
-               ":"))
-
-            (mkdir-p work)
-            (copy-recursively #+source app-dir #:follow-symlinks? #t)
-            (copy-recursively #+mix-deps-source deps-dir #:follow-symlinks? #t)
-            (invoke #$(file-append bash-minimal "/bin/sh")
-                    "-c"
-                    (string-append
-                     #$(file-append coreutils "/bin/cat")
-                     " "
-                     certs-dir
-                     "/*.pem > "
-                     cert-file))
-            (invoke #$(file-append coreutils "/bin/chmod")
-                    "-R" "u+w"
-                    app-dir
-                    deps-dir)
-
-            (setenv "PATH" path)
-            (setenv "HOME" (string-append app-dir "/.home"))
-            (setenv "MIX_HOME" (string-append app-dir "/.mix-home"))
-            (setenv "HEX_HOME" (string-append app-dir "/.hex"))
-            (setenv "XDG_CACHE_HOME" (string-append app-dir "/.cache"))
-            (setenv "MIX_DEPS_PATH" deps-dir)
-            (setenv "MIX_TARGET" "host")
-            (setenv "MIX_OS_CONCURRENCY_LOCK" "0")
-            (let ((existing-elixir-libs (getenv "GUIX_ELIXIR_LIBS")))
-              (setenv "GUIX_ELIXIR_LIBS"
-                      (if existing-elixir-libs
-                          (string-append hex-lib-dir ":" existing-elixir-libs)
-                          hex-lib-dir)))
-            (setenv "MIX_ENV" "prod")
-            (setenv "HEX_OFFLINE" "1")
-            (setenv "MIX_REBAR3" #$(file-append rebar3 "/bin/rebar3"))
-            (setenv "REBAR_GLOBAL_CONFIG_DIR"
-                    (string-append work "/rebar3"))
-            (setenv "REBAR_CACHE_DIR"
-                    (string-append work "/rebar3.cache"))
-            (setenv "ACLOCAL_PATH" aclocal-path)
-            (setenv "SHELL" #$(file-append bash-minimal "/bin/sh"))
-            (setenv "CONFIG_SHELL" #$(file-append bash-minimal "/bin/sh"))
-            (setenv "SSL_CERT_DIR" certs-dir)
-            (setenv "LANG" "C.UTF-8")
-            (setenv "LC_CTYPE" "C.UTF-8")
-            (setenv "ELIXIR_ERL_OPTIONS" "+fnu")
-            (setenv "SSL_CERT_FILE" cert-file)
-            (setenv "HEX_CACERTS_PATH" cert-file)
-            (let ((existing-cpath (getenv "CPATH")))
-              (setenv "CPATH"
-                      (if existing-cpath
-                          (string-append kernel-headers-dir ":" existing-cpath)
-                          kernel-headers-dir)))
-            (let ((existing-c-include-path (getenv "C_INCLUDE_PATH")))
-              (setenv "C_INCLUDE_PATH"
-                      (if existing-c-include-path
-                          (string-append kernel-headers-dir ":" existing-c-include-path)
-                          kernel-headers-dir)))
-            (setenv "CC" #$(file-append gcc-toolchain "/bin/gcc"))
-            (setenv "CXX" #$(file-append gcc-toolchain "/bin/g++"))
-            (setenv "CPP"
-                    (string-append #$(file-append gcc-toolchain "/bin/gcc")
-                                   " -E"))
-            (mkdir-p (getenv "HOME"))
-            (mkdir-p (getenv "MIX_HOME"))
-            (mkdir-p (getenv "HEX_HOME"))
-            (mkdir-p (getenv "XDG_CACHE_HOME"))
-
-            (with-directory-excursion app-dir
-              ;; Absinthe has been the last fragile dependency in Guix builds so
-              ;; far. Compile its immediate deps first, then compile Absinthe in
-              ;; its own pass before compiling the remaining dependency graph.
-              (invoke "mix" "deps.compile" "nimble_parsec" "telemetry" "decimal")
-              (let ((existing-erl-flags (getenv "ERL_FLAGS")))
-                ;; Keep the scheduler count pinned while compiling Absinthe so
-                ;; toolchain-sensitive ordering issues stay deterministic.
-                (setenv "ERL_FLAGS"
-                        (if existing-erl-flags
-                            (string-append existing-erl-flags " +S 1:1")
-                            "+S 1:1"))
-                (invoke "mix" "deps.compile" "absinthe" "--force")
-                (if existing-erl-flags
-                    (setenv "ERL_FLAGS" existing-erl-flags)
-                    (unsetenv "ERL_FLAGS")))
-              (invoke "mix" "deps.compile")
-              (invoke "mix" "compile" "--no-deps-check")
-              (invoke "mix" "release" "--no-deps-check" "--path" out)))))
-      (home-page home-page)
-      (synopsis synopsis)
-      (description description)
-      (license license:asl2.0))))
+    (mix:mix-release-package
+     source
+     #:mix-fod-deps mix-deps-source
+     #:name name
+     #:version version
+     #:home-page home-page
+     #:synopsis synopsis
+     #:description description
+     #:license license:asl2.0
+     #:native-inputs
+     (list autoconf
+           autoconf-wrapper
+           automake
+           gcc-toolchain
+           gawk
+           grep
+           gnu-make
+           libtool
+           linux-libre-headers
+           m4
+           perl
+           pkg-config
+           sed)
+     #:path-inputs
+     (list autoconf
+           autoconf-wrapper
+           automake
+           gcc-toolchain
+           gawk
+           grep
+           gnu-make
+           libtool
+           m4
+           perl
+           pkg-config
+           sed)
+     #:aclocal-inputs
+     (list automake libtool)
+     #:setup-gexp
+     #~(begin
+         (define kernel-headers-dir
+           #$(file-append linux-libre-headers "/include"))
+         (let ((existing-cpath (getenv "CPATH")))
+           (setenv "CPATH"
+                   (if existing-cpath
+                       (string-append kernel-headers-dir ":" existing-cpath)
+                       kernel-headers-dir)))
+         (let ((existing-c-include-path (getenv "C_INCLUDE_PATH")))
+           (setenv "C_INCLUDE_PATH"
+                   (if existing-c-include-path
+                       (string-append kernel-headers-dir ":"
+                                      existing-c-include-path)
+                       kernel-headers-dir)))
+         (setenv "CC" #$(file-append gcc-toolchain "/bin/gcc"))
+         (setenv "CXX" #$(file-append gcc-toolchain "/bin/g++"))
+         (setenv "CPP"
+                 (string-append #$(file-append gcc-toolchain "/bin/gcc")
+                                " -E")))
+     #:configure-gexp
+     #~(begin
+         ;; Absinthe has been the last fragile dependency in Guix builds so far.
+         ;; Compile its immediate deps first, then compile Absinthe in its own
+         ;; pass before compiling the remaining dependency graph.
+         (invoke "mix" "deps.compile" "nimble_parsec" "telemetry" "decimal")
+         (let ((existing-erl-flags (getenv "ERL_FLAGS")))
+           ;; Keep the scheduler count pinned while compiling Absinthe so
+           ;; toolchain-sensitive ordering issues stay deterministic.
+           (setenv "ERL_FLAGS"
+                   (if existing-erl-flags
+                       (string-append existing-erl-flags " +S 1:1")
+                       "+S 1:1"))
+           (invoke "mix" "deps.compile" "absinthe" "--force")
+           (if existing-erl-flags
+               (setenv "ERL_FLAGS" existing-erl-flags)
+               (unsetenv "ERL_FLAGS")))
+         (invoke "mix" "deps.compile")))))