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-rw-r--r--Library/Homebrew/dependencies.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/Library/Homebrew/dependencies.rb b/Library/Homebrew/dependencies.rb
index 5164058d0..8b056f4ae 100644
--- a/Library/Homebrew/dependencies.rb
+++ b/Library/Homebrew/dependencies.rb
@@ -29,7 +29,7 @@ class DependencyCollector
spec, tag = spec.shift if spec.is_a? Hash
dep = case spec
- when :x11
+ when :x11, :libpng
X11Dependency.new(tag)
when String
if LANGUAGE_MODULES.include? tag