diff --git a/src/irpf90_indent.py b/src/irpf90_indent.py
index 8faaf89..f715856 100755
--- a/src/irpf90_indent.py
+++ b/src/irpf90_indent.py
@@ -26,10 +26,21 @@
 
 
 import sys
+import os
 import re
 
 LENMAX = 70
 tabn = 2
+
+#copy of locals without "import copy"
+locals_ = {x: y for x, y in locals().items()}
+for key, value in locals_.items():
+    try:
+        val = os.environ["IRPF90_INDENT_"+key.upper()]
+        locals()[key] = type(locals_[key])(val)
+    except:
+        pass
+
 tab = " "*tabn
 
 class Grep(object):