--- libeio/libeio.m4	2019/03/10 12:11:47	1.33
+++ libeio/libeio.m4	2024/02/29 18:02:43	1.34
@@ -109,6 +109,17 @@
 ])],ac_cv_sync_file_range=yes,ac_cv_sync_file_range=no)])
 test $ac_cv_sync_file_range = yes && AC_DEFINE(HAVE_SYNC_FILE_RANGE, 1, sync_file_range(2) is available)
 
+AC_CACHE_CHECK(for copy_file_range, ac_cv_copy_file_range, [AC_LINK_IFELSE([AC_LANG_SOURCE([[
+#include <unistd.h>
+int main (void)
+{
+   off64_t o1, o2;
+   int res = copy_file_range (0, &o1, 1, &o2, 99, 0);
+   return 0;
+}
+]])],ac_cv_copy_file_range=yes,ac_cv_copy_file_range=no)])
+test $ac_cv_copy_file_range = yes && AC_DEFINE(HAVE_COPY_FILE_RANGE, 1, copy_file_range(2) is available)
+
 AC_CACHE_CHECK(for fallocate, ac_cv_linux_fallocate, [AC_LINK_IFELSE([AC_LANG_SOURCE([
 #include <fcntl.h>
 int main (void)