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-rw-r--r--ext/unicorn_http/extconf.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/unicorn_http/extconf.rb b/ext/unicorn_http/extconf.rb
index 80d00e5..11099cd 100644
--- a/ext/unicorn_http/extconf.rb
+++ b/ext/unicorn_http/extconf.rb
@@ -33,5 +33,7 @@ else
   message("no, needs Ruby 2.6+\n")
 end
 
-have_func('epoll_create1', %w(sys/epoll.h))
+if have_func('epoll_create1', %w(sys/epoll.h))
+  have_func('rb_io_descriptor') # Ruby 3.1+
+end
 create_makefile("unicorn_http")