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-rw-r--r--ext/sleepy_penguin/extconf.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/sleepy_penguin/extconf.rb b/ext/sleepy_penguin/extconf.rb
index 2ed9b21..0e6977a 100644
--- a/ext/sleepy_penguin/extconf.rb
+++ b/ext/sleepy_penguin/extconf.rb
@@ -13,6 +13,11 @@ have_header('sys/eventfd.h')
 have_header('sys/timerfd.h')
 have_header('sys/inotify.h')
 have_header('ruby/io.h') and have_struct_member('rb_io_t', 'fd', 'ruby/io.h')
+unless have_macro('CLOCK_MONOTONIC', 'time.h')
+  have_func('CLOCK_MONOTONIC', 'time.h')
+end
+have_type('clockid_t', 'time.h')
+have_func('clock_gettime', 'time.h')
 have_func('epoll_create1', %w(sys/epoll.h))
 have_func('rb_thread_call_without_gvl')
 have_func('rb_thread_blocking_region')