gnu: Add python-pyqt-builder.

* gnu/packages/qt.scm (python-pyqt-builder): New variable.

gnu/packages/qt.scm

@@ -2108,6 +2108,29 @@ itself.")
       ("qtwebchannel" ,qtwebchannel)
       ("qtwebengine" ,qtwebengine)))))
 
+(define-public python-pyqt-builder
+  (package
+   (name "python-pyqt-builder")
+   (version "1.9.0")
+   (source
+    (origin
+     (method url-fetch)
+     (uri (pypi-uri "PyQt-builder" version))
+     (sha256
+      (base32
+       "0nh0054c54ji3sm6d268fccf0y5f613spswwgwqd3rnn816hnljl"))))
+   (build-system python-build-system)
+   (inputs
+    `(("python-sip" ,python-sip)))
+   (home-page "https://www.riverbankcomputing.com/static/Docs/PyQt-builder/")
+   (synopsis "PEP 517 compliant PyQt build system")
+   (description "PyQt-builder is a tool for generating Python bindings for C++
+libraries that use the Qt application framework.  The bindings are built on
+top of the PyQt bindings for Qt.  PyQt-builder is used to build PyQt itself.")
+   ;; Either version 2 or 3, but no other version. See the file
+   ;; 'pyqtbuild/builder.py' in the source distribution for more information.
+   (license (list license:gpl2 license:gpl3))))
+
 (define-public python-qtpy
   (package
     (name "python-qtpy")