--- pyproj/datadir.py.orig	2021-09-18 03:47:50.000000000 +0300
+++ pyproj/datadir.py	2021-09-20 13:29:55.000000000 +0300
@@ -70,7 +70,7 @@
     global _VALIDATED_PROJ_DATA
     if _VALIDATED_PROJ_DATA is not None:
         return _VALIDATED_PROJ_DATA
-    internal_datadir = Path(__file__).absolute().parent / "proj_dir" / "share" / "proj"
+    internal_datadir = Path("%%INTERNAL_DATADIR%%")
     proj_lib_dirs = os.environ.get("PROJ_LIB", "")
     prefix_datadir = Path(sys.prefix, "share", "proj")