1 files changed, 11 insertions, 2 deletions
diff --git a/Library/Formula/webp.rb b/Library/Formula/webp.rb
index f08367d9b..2a3ebb5b7 100644
--- a/Library/Formula/webp.rb
+++ b/Library/Formula/webp.rb
@@ -5,12 +5,21 @@ class Webp < Formula
   url 'http://webp.googlecode.com/files/libwebp-0.2.0.tar.gz'
   sha1 'ac169a819cb4e7ece8d50d3f9f2608dac87a90e2'
 
-  depends_on :x11
-  depends_on 'jpeg'
+  depends_on :libpng
+  depends_on 'jpeg' => :recommended
 
   def install
     system "./configure", "--disable-dependency-tracking",
                           "--prefix=#{prefix}"
     system "make install"
   end
+
+  def test
+    mktemp do
+      system "#{bin}/cwebp", \
+        "/System/Library/Frameworks/SecurityInterface.framework/Versions/A/Resources/Key_Large.png", \
+        "-o", "webp_test.png"
+      system "#{bin}/dwebp", "webp_test.png", "-o", "webp_test.webp"
+    end
+  end
 end