diff -r 450cefec7c11 -r cc19f7ca2ed6 src/HOL/ex/Perm_Fragments.thy
--- a/src/HOL/ex/Perm_Fragments.thy	Fri Aug 18 13:55:05 2017 +0200
+++ b/src/HOL/ex/Perm_Fragments.thy	Fri Aug 18 20:47:47 2017 +0200
@@ -3,7 +3,7 @@
 section \<open>Fragments on permuations\<close>
 
 theory Perm_Fragments
-imports "~~/src/HOL/Library/Perm" "~~/src/HOL/Library/Dlist"
+imports "HOL-Library.Perm" "HOL-Library.Dlist"
 begin
 
 unbundle permutation_syntax