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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 fb680f7..f6bd0cc 100644
--- a/ext/kgio/extconf.rb
+++ b/ext/kgio/extconf.rb
@@ -49,5 +49,6 @@ have_func('rb_thread_io_blocking_region')
 have_func('rb_str_set_len')
 have_func('rb_time_interval')
 have_func('rb_wait_for_single_fd')
+have_func('rb_str_subseq')
 
 create_makefile('kgio_ext')