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-rw-r--r--ext/bigdecimal/extconf.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/ext/bigdecimal/extconf.rb b/ext/bigdecimal/extconf.rb
index d6be3e584e..a3ec7b4c6c 100644
--- a/ext/bigdecimal/extconf.rb
+++ b/ext/bigdecimal/extconf.rb
@@ -3,4 +3,8 @@ require 'mkmf'
have_func("labs", "stdlib.h")
have_func("llabs", "stdlib.h")
+have_type("struct RRational", "ruby.h")
+have_func("rb_rational_num", "ruby.h")
+have_func("rb_rational_den", "ruby.h")
+
create_makefile('bigdecimal')