Workaround for sip version mismatch on Arch

setup/build.py

@@ -487,6 +487,10 @@ def build_headless(self):
             os.rename(self.j(self.d(target), 'libheadless.dylib'), self.j(self.d(target), 'headless.so'))
 
     def create_sip_build_skeleton(self, src_dir, ext):
+        from setup.build_environment import pyqt_sip_abi_version
+        abi_version = ''
+        if pyqt_sip_abi_version():
+            abi_version = f'abi-version = "{pyqt_sip_abi_version()}"'
         sipf = ext.sip_files[0]
         needs_exceptions = 'true' if ext.needs_exceptions else 'false'
         with open(os.path.join(src_dir, 'pyproject.toml'), 'w') as f:
@@ -504,6 +508,7 @@ def create_sip_build_skeleton(self, src_dir, ext):
 
 [tool.sip.project]
 sip-files-dir = "."
+{abi_version}
 
 [tool.sip.bindings.pictureflow]
 headers = {ext.headers}

setup/build_environment.py

@@ -7,12 +7,26 @@
 __docformat__ = 'restructuredtext en'
 
 import os, subprocess, re, shutil
+from functools import lru_cache
 
 from setup import ismacos, iswindows, is64bit, islinux, ishaiku
 
 NMAKE = RC = msvc = MT = win_inc = win_lib = win_cc = win_ld = None
 
 
+@lru_cache(maxsize=2)
+def pyqt_sip_abi_version():
+    import PyQt5
+    if getattr(PyQt5, '__file__', None):
+        bindings_path = os.path.join(os.path.dirname(PyQt5.__file__), 'bindings', 'QtCore', 'QtCore.toml')
+        if os.path.exists(bindings_path):
+            with open(bindings_path) as f:
+                raw = f.read()
+                m = re.search(r'^sip-abi-version\s*=\s*"(.+?)"', raw, flags=re.MULTILINE)
+                if m is not None:
+                    return m.group(1)
+
+
 def merge_paths(a, b):
     a = [os.path.normcase(os.path.normpath(x)) for x in a.split(os.pathsep)]
     for q in b.split(os.pathsep):