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[bug#36642] [PATCH 2/2] gnu: python-gst: Fix build failure.

From: Christopher Baines
Subject: [bug#36642] [PATCH 2/2] gnu: python-gst: Fix build failure.
Date: Sat, 13 Jul 2019 23:01:02 +0100

Building python-gst fails with:

  Unbound variable: python-version

Therefore, add python-build-system to #:modules so that it's imported, and
give it a prefix to avoid clashing with the gnu-build-system.

Also, simplify the code by using the site-packages function from the
python-build-system module.

* gnu/packages/gstreamer.scm (python-gst)[arguments]: Rework to fix build
 gnu/packages/gstreamer.scm | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/gnu/packages/gstreamer.scm b/gnu/packages/gstreamer.scm
index b0f0b032b3..efb9a6f796 100644
--- a/gnu/packages/gstreamer.scm
+++ b/gnu/packages/gstreamer.scm
@@ -431,17 +431,14 @@ compression formats through the use of the libav 
     (build-system gnu-build-system)
-     ;; XXX: Factorize python-sitedir with python-build-system.
-     `(#:imported-modules (,@%gnu-build-system-modules
+     `(#:modules ((guix build gnu-build-system)
+                  ((guix build python-build-system) #:prefix python:))
+       #:imported-modules (,@%gnu-build-system-modules
                            (guix build python-build-system))
-       (let* ((python (assoc-ref %build-inputs "python"))
-              (python-version (python-version python))
-              (python-sitedir (string-append
-                               "lib/python" python-version "/site-packages")))
-         (list (string-append
-                "--with-pygi-overrides-dir=" %output "/" python-sitedir
-                "/gi/overrides")))))
+       (list (string-append
+              "--with-pygi-overrides-dir=" %output "/"
+              (python:site-packages %build-inputs %outputs) "/gi/overrides"))))
      `(("pkg-config" ,pkg-config)
        ("python" ,python)))

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