1 files changed, 7 insertions, 1 deletions
diff --git a/Library/Formula/mathgl.rb b/Library/Formula/mathgl.rb
index 25633952c..809b1bda9 100644
--- a/Library/Formula/mathgl.rb
+++ b/Library/Formula/mathgl.rb
@@ -6,7 +6,7 @@ class Mathgl < Formula
   sha1 '16b9ab58e654c5b91374f8a35eafc33630d7f5c0'
 
   depends_on 'gsl'
-  depends_on :x11
+  depends_on :libpng
 
   def install
     ENV['LIBS'] = '-lz'
@@ -20,4 +20,10 @@ class Mathgl < Formula
     system "make"
     system "make install"
   end
+
+  def test
+    mktemp do
+      system "#{bin}/mgl_example"
+    end
+  end
 end