diff --git a/src/auto/configure b/src/auto/configure
index db8a89b..062119e 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -13642,6 +13642,12 @@
   printf "%s\n" "#define HAVE_CLOCK_GETTIME 1" >>confdefs.h
 
 fi
+ac_fn_c_check_func "$LINENO" "sync" "ac_cv_func_sync"
+if test "x$ac_cv_func_sync" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYNC 1" >>confdefs.h
+
+fi