Option processing in zgrep stopped working since the AppArmor profile does not
allow /usr/bin/expr to be executed:

~> zgrep -ah . /dev/null
/usr/bin/zgrep: line 69: /usr/bin/expr: Permission denied
/usr/bin/zgrep: eval: line 70: unexpected EOF while looking for matching `''
/usr/bin/zgrep: eval: line 71: syntax error: unexpected end of file
/usr/bin/zgrep: line 71: /usr/bin/expr: Permission denied
/usr/bin/grep: .: Is a directory

The following patch fixes the problem (after reloading the profile of course):

--- /etc/apparmor.d/zgrep
+++ #<buffer zgrep>
@@ -20,6 +20,7 @@
   /usr/bin/bash ix,
   /usr/bin/bzip2 Cx -> helper,
   /usr/bin/cat ix,
+  /usr/bin/expr ix,
   /usr/bin/grep Cx -> helper,
   /usr/bin/gzip Cx -> helper,
   /usr/bin/mktemp ix,