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-rw-r--r--ext/tk/tkutil/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/tk/tkutil/extconf.rb b/ext/tk/tkutil/extconf.rb
index 20b6f37bce..a4b5e030bd 100644
--- a/ext/tk/tkutil/extconf.rb
+++ b/ext/tk/tkutil/extconf.rb
@@ -6,6 +6,7 @@ begin
have_func("rb_obj_taint", "ruby.h")
have_func("rb_sym2str", "ruby.h")
have_func("rb_id2str", "ruby.h")
+ have_func("rb_ary_cat", "ruby.h")
have_func("strndup", "string.h")
create_makefile('tkutil')