--- /opt/local/lib/ruby/site_ruby/1.8/rubygems.rb	2008-12-07 13:54:11.000000000 -0700
+++ /opt/local/lib/ruby/site_ruby/1.8/rubygems.rb	2008-12-07 13:54:11.000000000 -0700
@@ -128,6 +128,10 @@
   # Gem::Requirement and Gem::Version documentation.
 
   def self.activate(gem, *version_requirements)
+    if ENV["GEM_DEBUG"]
+      STDERR.puts "activating #{gem} #{version_requirements.inspect}"
+      caller[2..-1].each {|c| STDERR.puts "  #{c}"}
+    end
     if version_requirements.empty? then
       version_requirements = Gem::Requirement.default
     end