--- AmberTools/src/pytraj/base_setup/build_config.py~	2026-05-13 14:27:04.582707667 +0300
+++ AmberTools/src/pytraj/base_setup/build_config.py	2026-05-13 14:26:46.575892910 +0300
@@ -17,7 +17,7 @@
         self.disable_openmp = self._check_flag('--disable-openmp')
         self.use_amberlib = not self._check_flag('--disable-amberlib')
         # self.use_prebuilt = self._check_flag('--use-pre-cythonized')
-        self.use_prebuilt = True
+        self.use_prebuilt = False
         self.debug = self._check_flag('-debug')
         self.cythonize_only = self._check_flag('--cythonize')