check for diff using `command`

diff --git a/dehydrated b/dehydrated
index ba6fdf47de58bd0525dcbb852b98ed43387920fa..9f6e7784a7bd2f68210bbe97ee0c88d4dd44ccc8 100755 (executable)
--- a/dehydrated
+++ b/dehydrated
@@ -35,7 +35,7 @@ check_dependencies() {
   _sed "" < /dev/null > /dev/null 2>&1 || _exiterr "This script requires sed with support for extended (modern) regular expressions."
   command -v grep > /dev/null 2>&1 || _exiterr "This script requires grep."
   command -v mktemp > /dev/null 2>&1 || _exiterr "This script requires mktemp."
-  diff -u /dev/null /dev/null || _exiterr "This script requires diff."
+  command -v diff > /dev/null 2>&1 || _exiterr "This script requires diff."
 
   # curl returns with an error code in some ancient versions so we have to catch that
   set +e