From e14eca58dfc433510ca61356efb169e04263feec Mon Sep 17 00:00:00 2001
From: "Adam C. Stephens" <adam@valkor.net>
Date: Thu, 15 Jan 2026 13:45:12 -0500
Subject: [PATCH 1/2] add support for builder :make -> buildErlangMk

---
 lib/deps_nix/derivation.ex | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/lib/deps_nix/derivation.ex b/lib/deps_nix/derivation.ex
index 95d4622..dae745d 100644
--- a/lib/deps_nix/derivation.ex
+++ b/lib/deps_nix/derivation.ex
@@ -107,10 +107,20 @@ defmodule DepsNix.Derivation do
     {:hex, name, version, _hash, beam_builders, _sub_deps, _, sha256} = dep.opts[:lock]
     fetcher = %FetchHex{pkg: name, version: version, sha256: sha256}
 
+    builder =
+      case nix_builder(beam_builders) do
+        nil ->
+          IO.puts("Unknown builders #{inspect(beam_builders)} for dep: #{name}")
+          System.halt(1)
+
+        builder ->
+          builder
+      end
+
     new(dep,
       version: version,
       src: fetcher,
-      builder: nix_builder(beam_builders),
+      builder: builder,
       app_config_path: app_config_path(options)
     )
   end
@@ -119,6 +129,8 @@ defmodule DepsNix.Derivation do
     cond do
       Enum.member?(builders, :mix) -> "buildMix"
       Enum.member?(builders, :rebar3) -> "buildRebar3"
+      Enum.member?(builders, :make) -> "buildErlangMk"
+      true -> nil
     end
   end
 

From f0a84eb46ae971a6f18e4c430a50c49aed74d132 Mon Sep 17 00:00:00 2001
From: "Adam C. Stephens" <adam@valkor.net>
Date: Thu, 26 Feb 2026 10:32:31 -0500
Subject: [PATCH 2/2] add test for buildErlangMk

---
 fixtures/example/deps.nix         | 2 +-
 test/deps_nix/derivation_test.exs | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fixtures/example/deps.nix b/fixtures/example/deps.nix
index 04de271..5a46bc2 100644
--- a/fixtures/example/deps.nix
+++ b/fixtures/example/deps.nix
@@ -144,7 +144,7 @@ let
             name = "rustlerPrecompiled";
             toolchain = {
               name = "nightly-2025-06-23";
-              sha256 =  "sha256-UAoZcxg3iWtS+2n8TFNfANFt/GmkuOMDf7QAE0fRxeA=";
+              sha256 = "sha256-UAoZcxg3iWtS+2n8TFNfANFt/GmkuOMDf7QAE0fRxeA=";
             };
           }
         ];
diff --git a/test/deps_nix/derivation_test.exs b/test/deps_nix/derivation_test.exs
index 3241808..66c1f0d 100644
--- a/test/deps_nix/derivation_test.exs
+++ b/test/deps_nix/derivation_test.exs
@@ -131,6 +131,12 @@ defmodule DepsNix.DerivationTest do
     end
   end
 
+  property "selects buildErlangMk for :make builder" do
+    check all dep <- dep(scm: Mix.SCM.Hex, builders: [:make]) do
+      assert %Derivation{builder: "buildErlangMk"} = Derivation.from(dep, %DepsNix.Options{})
+    end
+  end
+
   test "doesn't include optional dependencies in beamDeps" do
     eventstore =
       %Mix.Dep{