diff --git a/pkgs/by-name/mn/mnxdom/package.nix b/pkgs/by-name/mn/mnxdom/package.nix
new file mode 100644
index 000000000000..664c61ec9745
--- /dev/null
+++ b/pkgs/by-name/mn/mnxdom/package.nix
@@ -0,0 +1,97 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  writeScript,
+
+  # nativeBuildInputs
+  cmake,
+  xxd,
+
+  # buildInputs
+  nlohmann_json,
+  nlohmann_json_schema_validator,
+  gtest,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "mnxdom";
+  version = "3.0";
+
+  src = fetchFromGitHub {
+    owner = "rpatters1";
+    repo = "mnxdom";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-zM8NRdVKY4RI9fNrVU/BpWOkhmmT9HLrOi21YKPGd0k=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    xxd
+  ];
+
+  propagatedBuildInputs = [
+    # nlohmann_json is a header only library, and we propagate it because it is
+    # being `#include`d in `${placeholder "dev"}/include`.
+    nlohmann_json
+  ];
+  buildInputs = [
+    nlohmann_json_schema_validator
+  ];
+
+  checkInputs = [
+    gtest
+  ];
+
+  cmakeFlags = [
+    (lib.cmakeBool "USE_SYSTEM_NLOHMANN_JSON" true)
+    (lib.cmakeBool "USE_SYSTEM_JSON_SCHEMA_VALIDATOR" true)
+    (lib.cmakeBool "USE_SYSTEM_GOOGLETEST" true)
+    (lib.cmakeBool "BUILD_SHARED_LIBS" (!stdenv.hostPlatform.isStatic))
+    (lib.cmakeFeature "MNX_W3C_SOURCE" (toString (finalAttrs.finalPackage.mnx_w3c)))
+  ];
+  doCheck = true;
+
+  outputs = [
+    "out"
+    "dev"
+  ];
+
+  passthru = {
+    # It is not a real package that needs building - it is just a bunch of
+    # files. It is comfortable though to have a pname & version for it, to be
+    # able to update it with automatic nix-update or alike. The meta.license is
+    # also slightly interesting.
+    mnx_w3c = stdenv.mkDerivation {
+      pname = "mnx";
+      version = "0-unstable-2026-02-17";
+
+      src = fetchFromGitHub {
+        owner = "w3c";
+        repo = "mnx";
+        rev = "d513cf7a28a84c803ed36e448b416cb49c3a22f9";
+        hash = "sha256-YFiy+2kV/he770BolhDllKW2a6izc+Zu1PdiZKW9mlY=";
+      };
+
+      builder = writeScript "builder.sh" ''
+        cp -r $src $out
+      '';
+
+      meta = {
+        description = "Music Notation CG next-generation music markup proposal";
+        homepage = "https://github.com/w3c/mnx";
+        license = lib.licenses.w3c;
+        platforms = lib.platforms.all;
+      };
+    };
+  };
+
+  meta = {
+    description = "MNX Document Object Model for C++17";
+    homepage = "https://github.com/rpatters1/mnxdom";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ doronbehar ];
+    mainProgram = "mnxdom";
+    platforms = lib.platforms.all;
+  };
+})
diff --git a/pkgs/by-name/nl/nlohmann_json_schema_validator/package.nix b/pkgs/by-name/nl/nlohmann_json_schema_validator/package.nix
index f6f36f8b0497..c8f8b78d0240 100644
--- a/pkgs/by-name/nl/nlohmann_json_schema_validator/package.nix
+++ b/pkgs/by-name/nl/nlohmann_json_schema_validator/package.nix
@@ -24,6 +24,10 @@ stdenv.mkDerivation (finalAttrs: {
   buildInputs = [ nlohmann_json ];
   nativeBuildInputs = [ cmake ];
 
+  cmakeFlags = [
+    (lib.cmakeBool "BUILD_SHARED_LIBS" (!stdenv.hostPlatform.isStatic))
+  ];
+
   meta = {
     description = "JSON schema validator for JSON for Modern C++";
     homepage = "https://github.com/pboettch/json-schema-validator";