Override default source and include directories for a library via "library.json" manifest using "includeDir" and "srcDir" fields

platformio/builder/tools/piolib.py

@@ -719,6 +719,18 @@ class PlatformIOLibBuilder(LibBuilderBase):
     def _is_arduino_manifest(self):
         return isfile(join(self.path, "library.properties"))
 
+    @property
+    def include_dir(self):
+        if "includeDir" in self._manifest.get("build", {}):
+            return self._manifest.get("build").get("includeDir")
+        return LibBuilderBase.include_dir.fget(self)
+
+    @property
+    def src_dir(self):
+        if "srcDir" in self._manifest.get("build", {}):
+            return self._manifest.get("build").get("srcDir")
+        return LibBuilderBase.src_dir.fget(self)
+
     @property
     def src_filter(self):
         if "srcFilter" in self._manifest.get("build", {}):