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-rw-r--r--ext/sleepy_penguin/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/sleepy_penguin/extconf.rb b/ext/sleepy_penguin/extconf.rb
index b1a95c4..e07f5d2 100644
--- a/ext/sleepy_penguin/extconf.rb
+++ b/ext/sleepy_penguin/extconf.rb
@@ -6,6 +6,7 @@ if have_header('sys/event.h')
 end
 have_header('sys/mount.h')
 have_header('sys/eventfd.h')
+have_header('sys/sendfile.h')
 
 # it's impossible to use signalfd reliably with Ruby since Ruby currently
 # manages # (and overrides) all signal handling