diff --git a/Makefile.am b/Makefile.am
index 4940fd739c..b9f1c6ad5c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -171,6 +171,7 @@ MODULES =					\
   guix/build-system/julia.scm			\
   guix/build-system/linux-module.scm		\
   guix/build-system/maven.scm			\
+  guix/build-system/mix.scm			\
   guix/build-system/node.scm			\
   guix/build-system/perl.scm			\
   guix/build-system/pyproject.scm		\
@@ -232,6 +233,7 @@ MODULES =					\
   guix/build/guile-build-system.scm		\
   guix/build/maven-build-system.scm		\
   guix/build/minetest-build-system.scm		\
+  guix/build/mix-build-system.scm		\
   guix/build/node-build-system.scm		\
   guix/build/perl-build-system.scm		\
   guix/build/pyproject-build-system.scm		\
diff --git a/gnu/local.mk b/gnu/local.mk
index c404d2f52f..ccc3c233bb 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -245,6 +245,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/electronics.scm			\
   %D%/packages/elf.scm				\
   %D%/packages/elixir.scm			\
+  %D%/packages/elixir-xyz.scm			\
   %D%/packages/elm.scm				\
   %D%/packages/embedded.scm			\
   %D%/packages/emacs.scm			\