diff -Naur Python-3.6.5-orig/Lib/distutils/cygwinccompiler.py Python-3.6.5/Lib/distutils/cygwinccompiler.py
--- Python-3.6.5-orig/Lib/distutils/cygwinccompiler.py	2018-04-16 09:53:47.576708700 +0300
+++ Python-3.6.5/Lib/distutils/cygwinccompiler.py	2018-04-16 09:53:53.907362900 +0300
@@ -48,7 +48,6 @@
 import os
 import sys
 import copy
-from subprocess import Popen, PIPE, check_output
 import re
 
 from distutils.ccompiler import gen_preprocess_options, gen_lib_options
@@ -385,6 +384,7 @@
     executable = cmd.split()[0]
     if find_executable(executable) is None:
         return None
+    from subprocess import Popen, PIPE
     out = Popen(cmd, shell=True, stdout=PIPE).stdout
     try:
         out_string = out.read()