diff --git a/pybuild/build.py b/pybuild/build.py
index 3244ff3..561fb22 100644
--- a/pybuild/build.py
+++ b/pybuild/build.py
@@ -524,8 +524,10 @@ def copy_files_to_include(build_cfg):
     LOG.info("******************************************************")
     LOG.info("Start copying extra included source files")
     start_time = time.time()
-    include_paths = build_cfg.get_includes_paths()
     src_dst_dir = build_cfg.get_src_code_dst_dir()
+
+    # Copy some files flat to the destination directory
+    include_paths = build_cfg.get_includes_paths_flat()
     files = []
     for include_path in include_paths:
         if os.path.isdir(include_path):
@@ -543,6 +545,16 @@ def copy_files_to_include(build_cfg):
     for file_ in files:
         shutil.copy2(file_, src_dst_dir)
         LOG.debug("copied %s to %s", file_, src_dst_dir)
+
+    # Copy some directories as is to the destination directory
+    include_tree_paths = [Path(p) for p in build_cfg.get_includes_paths_tree()]
+    existing_tree_paths = [p for p in include_tree_paths if p.exists()]
+    missing_tree_paths = [p for p in include_tree_paths if not p.exists()]
+    if missing_tree_paths:
+        LOG.warning(f"Missing include paths: {missing_tree_paths}")
+    for path in existing_tree_paths:
+        shutil.copytree(path, src_dst_dir, dirs_exist_ok=True)
+        LOG.debug(f"copied {path} to {src_dst_dir}")
     LOG.info(
         "Finished copying extra included files (in %4.2f s)", time.time() - start_time
     )
diff --git a/pybuild/build_proj_config.py b/pybuild/build_proj_config.py
index 6b944e3..3b750cd 100644
--- a/pybuild/build_proj_config.py
+++ b/pybuild/build_proj_config.py
@@ -305,11 +305,16 @@ class BuildProjConfig:
             units = units.union(set(runits))
         self._all_units = list(units)
 
-    def get_includes_paths(self):
-        """Return list of paths to files to include in source directory."""
+    def get_includes_paths_flat(self):
+        """Return list of paths to files to be included flat in source directory."""
         includes_paths = self._prj_cfg.get('includesPaths', [])
         return [os.path.join(self.get_root_dir(), os.path.normpath(path)) for path in includes_paths]
 
+    def get_includes_paths_tree(self):
+        """Return list of paths to files to included with directories in source directory."""
+        includes_paths_tree = self._prj_cfg.get('includesPathsTree', [])
+        return [os.path.join(self.get_root_dir(), os.path.normpath(path)) for path in includes_paths_tree]
+
     def get_all_units(self):
         """Return a list of all the units."""
         return self._all_units