You're breathtaking!

Source/Tools/Flax.Build/Build/HeaderOnlyModule.cs

@@ -0,0 +1,18 @@
+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+namespace Flax.Build
+{
+    /// <summary>
+    /// The build module from 3rd Party source that contains only header files.
+    /// </summary>
+    /// <seealso cref="Flax.Build.ThirdPartyModule" />
+    public class HeaderOnlyModule : ThirdPartyModule
+    {
+        /// <inheritdoc />
+        public HeaderOnlyModule()
+        {
+            // Don't generate any binaries
+            BinaryModuleName = null;
+        }
+    }
+}