From 5b3df16469638ba367b148f5e22972f2d4acd478 Mon Sep 17 00:00:00 2001
From: Dan Porter <dreid@gmail.com>
Date: Tue, 1 Apr 2014 15:32:06 +0100
Subject: [PATCH] Add exclude-dir option only if grep supports it

Older versions of grep pre 2.5.2 did not have this option. Providing it
breaks grep use under oh-my-zsh on these systems. This patch adds a
check to ensure the option is only used if the manpages list it.
---
 lib/grep.zsh | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/grep.zsh b/lib/grep.zsh
index 977435ee4..49c156a69 100644
--- a/lib/grep.zsh
+++ b/lib/grep.zsh
@@ -3,11 +3,13 @@
 # Examples: http://rubyurl.com/ZXv
 #
 
-# avoid VCS folders
+# avoid VCS folders if grep supports it
 GREP_OPTIONS=
-for PATTERN in .cvs .git .hg .svn; do
-    GREP_OPTIONS+="--exclude-dir=$PATTERN "
-done
+if [[ "$(man grep | grep -q exclude-dir)" != "1" ]]; then
+    for PATTERN in .cvs .git .hg .svn; do
+        GREP_OPTIONS+="--exclude-dir=$PATTERN "
+    done
+fi
 GREP_OPTIONS+="--color=auto"
 export GREP_OPTIONS="$GREP_OPTIONS"
 export GREP_COLOR='1;32'