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-rw-r--r--ext/tk/extconf.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/tk/extconf.rb b/ext/tk/extconf.rb
index 12bccd58f7..a6e87eb5b3 100644
--- a/ext/tk/extconf.rb
+++ b/ext/tk/extconf.rb
@@ -1795,7 +1795,9 @@ print("check functions.")
%w"ruby_native_thread_p rb_errinfo rb_safe_level rb_hash_lookup
rb_proc_new rb_obj_untrust rb_obj_taint rb_set_safe_level_force
- rb_sourcefile rb_thread_alive_p rb_thread_check_trap_pending".each do |func|
+ rb_sourcefile rb_thread_alive_p rb_thread_check_trap_pending
+ ruby_enc_find_basename
+".each do |func|
have_func(func, "ruby.h")
print(".") # progress
end