ext/pitchfork_http/extconf.rb in pitchfork-0.11.0 vs ext/pitchfork_http/extconf.rb in pitchfork-0.11.1

@@ -1,9 +1,11 @@
 # -*- encoding: binary -*-
 require 'mkmf'
 
 have_const("PR_SET_CHILD_SUBREAPER", "sys/prctl.h")
 have_func("rb_enc_interned_str", "ruby.h") # Ruby 3.0+
+have_func("rb_io_descriptor", "ruby.h") # Ruby 3.1+
+
 if RUBY_VERSION.start_with?('3.0.')
   # https://bugs.ruby-lang.org/issues/18772
   $CFLAGS << ' -DRB_ENC_INTERNED_STR_NULL_CHECK=1 '
 else
   $CFLAGS << ' -DRB_ENC_INTERNED_STR_NULL_CHECK=0 '