gnu: hangups: Fix build.

* gnu/packages/messaging.scm (hangups)[propagated-inputs]:
Use python-protobuf-3.6 specifically.

diff --git a/gnu/packages/messaging.scm b/gnu/packages/messaging.scm
index c81ac6f..a1b762e 100644 (file)
--- a/gnu/packages/messaging.scm
+++ b/gnu/packages/messaging.scm
@@ -1843,7 +1843,7 @@ QMatrixClient project.")
        ("python-async-timeout" ,python-async-timeout)
        ("python-configargparse" ,python-configargparse)
        ("python-mechanicalsoup" ,python-mechanicalsoup)
-       ("python-protobuf" ,python-protobuf)
+       ("python-protobuf" ,python-protobuf-3.6)
        ("python-readlike" ,python-readlike)
        ("python-reparser" ,python-reparser)
        ("python-requests" ,python-requests)