--- Lib/subprocess.py
+++ Lib/subprocess.py
@@ -370,17 +370,20 @@
         class pywintypes:
             error = IOError
 else:
-    import select
-    _has_poll = hasattr(select, 'poll')
     import errno
-    import fcntl
-    import pickle
+    try:
+        import select
+    except ImportError:
+        select = None
+    _has_poll = hasattr(select, 'poll')
 
     # When select or poll has indicated that the file is writable,
     # we can write up to _PIPE_BUF bytes without risk of blocking.
     # POSIX defines PIPE_BUF as >= 512.
     _PIPE_BUF = getattr(select, 'PIPE_BUF', 512)
 
+    del select
+
 
 __all__ = ["Popen", "PIPE", "STDOUT", "call", "check_call", "getstatusoutput",
            "getoutput", "check_output", "CalledProcessError"]
@@ -1007,12 +1010,18 @@
 
         def _set_cloexec_flag(self, fd):
             try:
-                cloexec_flag = fcntl.FD_CLOEXEC
-            except AttributeError:
-                cloexec_flag = 1
+                import fcntl
 
-            old = fcntl.fcntl(fd, fcntl.F_GETFD)
-            fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)
+                try:
+                    cloexec_flag = fcntl.FD_CLOEXEC
+                except AttributeError:
+                    cloexec_flag = 1
+
+                old = fcntl.fcntl(fd, fcntl.F_GETFD)
+                fcntl.fcntl(fd, fcntl.F_SETFD, old | cloexec_flag)
+            except ImportError:
+                # fcntl module cannot be used when building Python.
+                pass
 
 
         def _close_fds(self, but):
@@ -1105,6 +1114,7 @@
                                 os.execvpe(executable, args, env)
 
                         except:
+                            import pickle
                             exc_type, exc_value, tb = sys.exc_info()
                             # Save the traceback and attach it to the exception
                             # object
@@ -1140,6 +1150,7 @@
                 os.close(errpipe_read)
 
             if data:
+                import pickle
                 os.waitpid(self.pid, 0)
                 child_exception = pickle.loads(data)
                 for fd in (p2cwrite, c2pread, errread):
@@ -1215,6 +1226,7 @@
 
 
         def _communicate_with_poll(self, input):
+            import select
             stdout = None # Return
             stderr = None # Return
             fd2file = {}
@@ -1272,6 +1284,7 @@
 
 
         def _communicate_with_select(self, input):
+            import select
             read_set = []
             write_set = []
             stdout = None # Return