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-rw-r--r--ext/unicorn_http/extconf.rb5
1 files changed, 4 insertions, 1 deletions
diff --git a/ext/unicorn_http/extconf.rb b/ext/unicorn_http/extconf.rb
index 80d00e5..de896fe 100644
--- a/ext/unicorn_http/extconf.rb
+++ b/ext/unicorn_http/extconf.rb
@@ -1,4 +1,5 @@
 # -*- encoding: binary -*-
+# frozen_string_literal: false
 require 'mkmf'
 
 have_func("rb_hash_clear", "ruby.h") or abort 'Ruby 2.0+ required'
@@ -33,5 +34,7 @@ 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")