--- pkg-config-1.1.5/lib/pkg-config.rb.orig	2014-04-18 21:04:38.587173463 +0200
+++ pkg-config-1.1.5/lib/pkg-config.rb	2014-04-18 21:05:28.387172425 +0200
@@ -103,9 +103,10 @@
 
   attr_reader :paths
   attr_accessor :msvc_syntax
-  def initialize(name, options={})
+  def initialize(name, options={}, seen=[])
     @name = name
     @options = options
+    @seen = seen
     path = @options[:path] || ENV["PKG_CONFIG_PATH"]
     @paths = [path, guess_default_path].compact.join(SEPARATOR).split(SEPARATOR)
     @paths.unshift(*(@options[:paths] || []))
@@ -193,7 +194,9 @@
   private
   def collect_cflags
     all_cflags = all_required_packages.collect do |package|
-      self.class.new(package, @options).cflags
+      if !@seen.include?(package)
+        self.class.new(package, @options, @seen + [package]).cflags
+      end
     end
     all_cflags = [declaration("Cflags")] + all_cflags
     all_cflags = all_cflags.join(" ").gsub(/-I /, '-I').split.uniq
@@ -211,7 +214,9 @@
 
   def collect_libs
     all_libs = required_packages.collect do |package|
-      self.class.new(package, @options).libs
+      if !@seen.include?(package)
+        self.class.new(package, @options, @seen + [package]).libs
+      end
     end
     all_libs = [declaration("Libs")] + all_libs
     all_libs = all_libs.join(" ").gsub(/-([Ll]) /, '\1').split.uniq