diff --git a/core/include/ldml/.gitignore b/core/include/ldml/.gitignore
new file mode 100644
index 0000000000..3e39f0a460
--- /dev/null
+++ b/core/include/ldml/.gitignore
@@ -0,0 +1 @@
+ldml-const-builder/
\ No newline at end of file
diff --git a/core/include/ldml/package.json b/core/include/ldml/package.json
new file mode 100644
index 0000000000..61b71870d9
--- /dev/null
+++ b/core/include/ldml/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "@keymanapp/ldml-keyboard-constants",
+  "description": "Keyman LDML keyboard constants",
+  "keywords": [
+    "keyboard",
+    "keyman",
+    "ldml",
+    "unicode"
+  ],
+  "license": "MIT",
+  "main": "build/keyboardprocessor_ldml.js",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/keymanapp/keyman.git"
+  }
+}
diff --git a/core/include/ldml/tsconfig.build.json b/core/include/ldml/tsconfig.build.json
new file mode 100644
index 0000000000..1a7b9fdfbb
--- /dev/null
+++ b/core/include/ldml/tsconfig.build.json
@@ -0,0 +1,18 @@
+{
+    "extends": "../../../tsconfig-base.json",
+    "compilerOptions": {
+        "composite": true,
+        "declaration": true,
+        "module": "CommonJS",
+        "moduleResolution": "node",
+        "rootDir": ".",
+        "outDir": "ldml-const-builder/",
+    },
+    "exclude": [
+        "node_modules"
+    ],
+    "files": [
+        "keyboardprocessor_ldml.ts",
+        "ldml-const-builder.ts"
+    ]
+}
diff --git a/core/include/ldml/tsconfig.json b/core/include/ldml/tsconfig.json
index 01411ba39e..f8a56d0687 100644
--- a/core/include/ldml/tsconfig.json
+++ b/core/include/ldml/tsconfig.json
@@ -5,13 +5,13 @@
         "declaration": true,
         "module": "CommonJS",
         "moduleResolution": "node",
+        "rootDir": ".",
         "outDir": "build/",
     },
     "exclude": [
         "node_modules"
     ],
     "files": [
-        "keyboardprocessor_ldml.ts",
-        "ldml-const-builder.ts"
+        "keyboardprocessor_ldml.ts"
     ]
 }
diff --git a/core/tools/ldml-const-builder/build.sh b/core/tools/ldml-const-builder/build.sh
index c19e34e27c..d231d2967d 100755
--- a/core/tools/ldml-const-builder/build.sh
+++ b/core/tools/ldml-const-builder/build.sh
@@ -36,13 +36,13 @@ fi
 
 if builder_has_action build; then
   # Generate index.ts
-  npx tsc -b ../../include/ldml/
+  npx tsc -b ../../include/ldml/tsconfig.build.json
 
   builder_report success build
 fi
 
 if builder_has_action run; then
-  node ../../include/ldml/build/core/include/ldml/ldml-const-builder.js > ${KBP_LDML_H_FILE}
+  node ../../include/ldml/ldml-const-builder/ldml-const-builder.js > ${KBP_LDML_H_FILE}
   echo "Updated ${KBP_LDML_H_FILE}"
 
   builder_report success run
diff --git a/developer/src/kmldmlc/src/keyman/kmx/kmx-plus.ts b/developer/src/kmldmlc/src/keyman/kmx/kmx-plus.ts
new file mode 100644
index 0000000000..f464a05272
--- /dev/null
+++ b/developer/src/kmldmlc/src/keyman/kmx/kmx-plus.ts
@@ -0,0 +1,11 @@
+// import * as r from 'restructure';
+
+import { constants } from '@keymanapp/ldml-keyboard-constants';
+
+// Uses defns from ...
+
+export default class KMXPlusFile {
+  constructor() {
+    console.log(constants);
+  }
+}
\ No newline at end of file
diff --git a/developer/src/kmldmlc/tsconfig.json b/developer/src/kmldmlc/tsconfig.json
index ccdb2efcfe..d6f6004769 100644
--- a/developer/src/kmldmlc/tsconfig.json
+++ b/developer/src/kmldmlc/tsconfig.json
@@ -22,5 +22,6 @@
   ],
   "references": [
     { "path": "../../../common/web/keyman-version" },
+    { "path": "../../../core/include/ldml/"}
   ]
 }
diff --git a/package-lock.json b/package-lock.json
index 8fc6dbd502..027c55279f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,6 +8,7 @@
       "workspaces": [
         "resources/gosh",
         "resources/build/version",
+        "core/include/ldml",
         "developer/src/kmlmc",
         "developer/src/kmldmlc",
         "developer/src/server",
@@ -376,6 +377,10 @@
       "integrity": "sha512-B9EoJFjhqcQ9OmQrNorItO+OwEOORNn3S31WuiHvZY/dm9ajkB7AKD/8toessEtHHNL+58jofbq7hMMY9v4yig==",
       "dev": true
     },
+    "core/include/ldml": {
+      "name": "@keymanapp/ldml-keyboard-constants",
+      "license": "MIT"
+    },
     "developer/js": {
       "name": "@keymanapp/lexical-model-compiler",
       "extraneous": true,
@@ -1057,6 +1062,10 @@
       "resolved": "developer/src/kmldmlc",
       "link": true
     },
+    "node_modules/@keymanapp/ldml-keyboard-constants": {
+      "resolved": "core/include/ldml",
+      "link": true
+    },
     "node_modules/@keymanapp/lexical-model-compiler": {
       "resolved": "developer/src/kmlmc",
       "link": true
@@ -7735,7 +7744,7 @@
         "chai": "^4.3.4",
         "chalk": "^2.4.2",
         "commander": "^3.0.0",
-        "crc-32": "*",
+        "crc-32": "^1.2.2",
         "mocha": "^8.4.0",
         "restructure": "^3.0.0",
         "ts-node": "^9.1.1",
@@ -7807,6 +7816,9 @@
         }
       }
     },
+    "@keymanapp/ldml-keyboard-constants": {
+      "version": "file:core/include/ldml"
+    },
     "@keymanapp/lexical-model-compiler": {
       "version": "file:developer/src/kmlmc",
       "requires": {
diff --git a/package.json b/package.json
index f6d54cb36d..fadefef382 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   "workspaces": [
     "resources/gosh",
     "resources/build/version",
+    "core/include/ldml",
     "developer/src/kmlmc",
     "developer/src/kmldmlc",
     "developer/src/server",