--- /dev/null
+diff -u -r ../debianutils-4.4/add-shell ./add-shell
+--- ../debianutils-4.4/add-shell 2013-07-28 03:30:26.000000000 +0200
++++ ./add-shell 2014-05-30 16:07:00.000000000 +0200
+@@ -6,7 +6,7 @@
+ exit 1
+ fi
+
+-file=/etc/shells
++file=@TERMUX_PREFIX@/etc/shells
+ # I want this to be GUARANTEED to be on the same filesystem as $file
+ tmpfile=${file}.tmp
+