1 files changed, 1 insertions, 2 deletions
diff --git a/Library/Formula/netpbm.rb b/Library/Formula/netpbm.rb
index dcaa711b8..4134a0ed4 100644
--- a/Library/Formula/netpbm.rb
+++ b/Library/Formula/netpbm.rb
@@ -9,10 +9,9 @@ class Netpbm < Formula
 
   depends_on "libtiff"
   depends_on "jasper"
+  depends_on :libpng
 
   def install
-    ENV.x11 # For PNG
-
     if ARGV.build_head?
       system "cp", "config.mk.in", "config.mk"
       config = "config.mk"