https://sources.debian.org/data/main/p/pyqt5/5.11.2+dfsg-1/debian/patches/public_sip.diff

From: Dmitry Shachnev <mitya57@debian.org>
Date: Tue, 3 Jul 2018 09:46:42 +0300
Subject: Use the public version of sip module

Per https://www.debian.org/doc/debian-policy/#convenience-copies-of-code.
---
 configure.py | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/configure.py b/configure.py
index 7c48136..ca23f93 100644
--- a/configure.py
+++ b/configure.py
@@ -642,15 +642,6 @@ class TargetConfiguration:
                     "Unable to import enum.  Please install the enum34 "
                     "package from PyPI.")
 
-        # Check there is a private copy of the sip module already installed.
-        try:
-            from PyQt5 import sip
-        except ImportError:
-            error(
-                    "Unable to import PyQt5.sip.  Make sure you have "
-                    "configured SIP to create a private copy of the sip "
-                    "module.")
-
         # Get the details of the Python interpreter library.
         py_major = self.py_version >> 16
         py_minor = (self.py_version >> 8) & 0x0ff
@@ -2438,7 +2429,7 @@ def get_sip_flags(target_config):
     the target configuration.
     """
 
-    sip_flags = ['-n', 'PyQt5.sip']
+    sip_flags = ['-n', 'sip']
 
     # If we don't check for signed interpreters, we exclude the 'VendorID'
     # feature
@@ -2914,14 +2905,6 @@ def check_sip(target_config):
     target_config is the target configuration.
     """
 
-    # Check there is a private copy of the sip module already installed.
-    try:
-        from PyQt5 import sip
-    except ImportError:
-        error(
-                "Unable to import PyQt5.sip.  Make sure you have configured "
-                "SIP to create a private copy of the sip module.")
-
     if target_config.sip is None:
         error(
                 "Make sure you have a working sip on your PATH or use the "
