1 files changed, 1 insertions, 5 deletions
diff --git a/Library/Formula/gdal.rb b/Library/Formula/gdal.rb
index 35e29d4d1..91654a00f 100644
--- a/Library/Formula/gdal.rb
+++ b/Library/Formula/gdal.rb
@@ -55,10 +55,6 @@ class Gdal < Formula
     depends_on "poppler"
   end
 
-  def png_prefix
-    MacOS.version >= :mountain_lion ? HOMEBREW_PREFIX/"opt/libpng" : MacOS::X11.prefix
-  end
-
   def get_configure_args
     args = [
       # Base configuration.
@@ -79,7 +75,7 @@ class Gdal < Formula
       # Backends supported by OS X.
       "--with-libiconv-prefix=/usr",
       "--with-libz=/usr",
-      "--with-png=#{png_prefix}",
+      "--with-png=#{Formula["libpng"].opt_prefix}",
       "--with-expat=/usr",
       "--with-curl=/usr/bin/curl-config",