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-rw-r--r--ext/bigdecimal/extconf.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/bigdecimal/extconf.rb b/ext/bigdecimal/extconf.rb
index fc448ed380..63123e2892 100644
--- a/ext/bigdecimal/extconf.rb
+++ b/ext/bigdecimal/extconf.rb
@@ -42,6 +42,8 @@ have_func("rb_complex_imag", "ruby.h")
have_func("rb_array_const_ptr", "ruby.h")
have_func("rb_sym2str", "ruby.h")
have_func("rb_opts_exception_p", "ruby.h")
+have_func("rb_category_warn", "ruby.h")
+have_const("RB_WARN_CATEGORY_DEPRECATED", "ruby.h")
if File.file?(File.expand_path('../lib/bigdecimal.rb', __FILE__))
bigdecimal_rb = "$(srcdir)/lib/bigdecimal.rb"