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-rw-r--r--ext/kgio/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/kgio/extconf.rb b/ext/kgio/extconf.rb
index 09d710b..dcc1418 100644
--- a/ext/kgio/extconf.rb
+++ b/ext/kgio/extconf.rb
@@ -15,6 +15,7 @@ else
 end
 have_func('rb_io_ascii8bit_binmode')
 have_func('rb_thread_blocking_region')
+have_func('rb_str_set_len')
 
 dir_config('kgio')
 create_makefile('kgio_ext')