--- greenlet-0.4.15/benchmarks/chain.py.orig	2016-12-11 00:52:06.000000000 +0100
+++ greenlet-0.4.15/benchmarks/chain.py	2020-01-01 21:06:15.218260648 +0100
@@ -5,7 +5,10 @@
 """
 
 import optparse
-import time
+try:
+    from time import perf_counter
+except:
+    from time import clock as perf_counter
 
 import greenlet
 
@@ -34,6 +37,6 @@
     if len(args) != 0:
         p.error('unexpected arguments: %s' % ', '.join(args))
 
-    start_time = time.clock()
+    start_time = perf_counter()
     print 'Result:', chain(options.num_greenlets)
-    print time.clock() - start_time, 'seconds'
+    print perf_counter() - start_time, 'seconds'