I meant to do this originally.

build.py

@@ -741,7 +741,7 @@ class CustomTarget:
                 raise InvalidArguments('"install_dir" must be a string.')
         else:
             self.install = False
-        self.build_always = kwargs.get('build_always', True)
+        self.build_always = kwargs.get('build_always', False)
         if not isinstance(self.build_always, bool):
             raise InvalidArguments('Argument build_always must be a boolean.')