vips: use system libpng

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Formula/vips.rb b/Library/Formula/vips.rb
index fd39ceb7b..0f529321a 100644
--- a/Library/Formula/vips.rb
+++ b/Library/Formula/vips.rb
@@ -16,7 +16,6 @@ class Vips < Formula
   depends_on 'glib'
   depends_on 'jpeg' => :optional
   depends_on 'libtiff' => :optional
-  depends_on 'libpng' => :optional
   depends_on 'imagemagick' => :optional
   depends_on 'fftw' => :optional
   depends_on 'little-cms' => :optional
@@ -26,6 +25,7 @@ class Vips < Formula
   depends_on 'openexr' => :optional
 
   def install
+    ENV.x11 # for libpng
     system "./configure", "--prefix=#{prefix}"
     system "make install"
   end