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-rw-r--r--lib/dtas/sigevent/efd.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/dtas/sigevent/efd.rb b/lib/dtas/sigevent/efd.rb
index 4be2c84..22772ee 100644
--- a/lib/dtas/sigevent/efd.rb
+++ b/lib/dtas/sigevent/efd.rb
@@ -3,6 +3,8 @@
 
 # used in various places for safe wakeups from IO.select via signals
 # This requires a modern Linux system and the "sleepy_penguin" RubyGem
+require 'sleepy_penguin'
+
 class DTAS::Sigevent < SleepyPenguin::EventFD # :nodoc:
   def self.new
     super(0, :CLOEXEC)