Index: wflow-py/wflow/__init__.py
===================================================================
diff -u -ra0638f1d565ab6a51c556ca0ee26269f16993557 -r6645d9047a90c38c98ee1a8488e24b6046c61531
--- wflow-py/wflow/__init__.py	(.../__init__.py)	(revision a0638f1d565ab6a51c556ca0ee26269f16993557)
+++ wflow-py/wflow/__init__.py	(.../__init__.py)	(revision 6645d9047a90c38c98ee1a8488e24b6046c61531)
@@ -22,3 +22,5 @@
     # set environment variable instead of pyproj_datadir such
     # that child processes will inherit it
     os.environ['PROJ_DIR'] = os.path.join(basedir, 'proj-data')
+    # Fiona expects PROJ_LIB instead
+    os.environ['PROJ_LIB'] = os.path.join(basedir, 'proj-data')