nixpkgs/pkgs/development/python-modules/pyqt/pyqt5-fix-dbus-mainloop-support.patch

From 944d5467e1655aac20a14325631df6daccaf5804 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Sun, 3 Mar 2019 01:13:46 +0100
Subject: [PATCH] Fix building on Nix

./configure.py tries to find dbus-python header in dbus-1 includedir
obtained from pkg-config or from --dbus flag. Unfortunately, when supplied,
it also uses the flag for locating dbus-1 headers. This fails on Nix,
since every package is installed into its own immutable tree so we cannot
use a single directory for both dbus-python and dbus-1. We can fix this by
using pkg-config for finding dbus-python headers too.

Additionally, the build system also tries to install the dbus support module
to dbus-python tree. Often, it is possible to handle this in pkgconfig as well [1]
but unfortunately, dbus-python does not export the moduledir in its pc file
so I have decided to solve this with an extra configure flag.

[1]: https://www.bassi.io/articles/2018/03/15/pkg-config-and-paths/
---
 configure.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/configure.py b/configure.py
index c6663e4..65e7da7 100644
--- a/configure.py
+++ b/configure.py
@@ -905,6 +905,9 @@ class TargetConfiguration:
         if opts.pydbusincdir is not None:
             self.pydbus_inc_dir = opts.pydbusincdir
 
+        if opts.pydbusmoduledir is not None:
+            self.pydbus_module_dir = opts.pydbusmoduledir
+
         if opts.pyuicinterpreter is not None:
             self.pyuic_interpreter = opts.pyuicinterpreter
 
@@ -1191,6 +1194,11 @@ def create_optparser(target_config):
             metavar="DIR",
             help="the directory containing the dbus/dbus-python.h header is "
             "DIR [default: supplied by pkg-config]")
+    g.add_option("--dbus-moduledir", dest='pydbusmoduledir', type='string',
+            default=None, action='callback', callback=store_abspath,
+            metavar="DIR",
+            help="the directory where dbus support module will be installed to"
+            "DIR [default: obtained from dbus.mainloop python module]")
     p.add_option_group(g)
 
     # Installation.
@@ -2277,7 +2285,7 @@ def check_dbus(target_config, verbose):
 
     inform("Checking to see if the dbus support module should be built...")
 
-    cmd = 'pkg-config --cflags-only-I --libs dbus-1'
+    cmd = 'pkg-config --cflags-only-I --libs dbus-1 dbus-python'
 
     if verbose:
         sys.stdout.write(cmd + "\n")
@@ -2307,7 +2315,8 @@ def check_dbus(target_config, verbose):
         inform("The Python dbus module doesn't seem to be installed.")
         return
 
-    target_config.pydbus_module_dir = dbus.mainloop.__path__[0]
+    if target_config.pydbus_module_dir == '':
+        target_config.pydbus_module_dir = dbus.mainloop.__path__[0]
 
     # Try and find dbus-python.h.  We don't use pkg-config because it is broken
     # for dbus-python (at least for versions up to and including v0.81.0).
diff --git a/project.py b/project.py
index fe9fbce..9ae1ca1 100644
--- a/project.py
+++ b/project.py
@@ -261,7 +261,7 @@ del find_qt
         dbus_lib_dirs = []
         dbus_libs = []
 
-        args = ['pkg-config', '--cflags-only-I', '--libs dbus-1']
+        args = ['pkg-config', '--cflags-only-I', '--libs dbus-1', 'dbus-python']
 
         for line in self.read_command_pipe(args, fatal=False):
             for flag in line.strip().split():