commit 87cef643afd5143795871cc7de0b50cd2fde51f5
Author: Simon McVittie <simon.mcvittie@collabora.co.uk>
Date:   2009-07-09 09:53:14 +0100

    TpProxyPendingCall: fix rare crash when cancelled before we've been given our DBusGProxyCall
    
    One of the telepathy-mission-control regression tests hit an assertion
    failure in dbus_g_proxy_cancel_call (., call=0x0), with
    tp_proxy_pending_call_lost_weak_ref on the stack. As far as I can tell,
    this can only happen if the weak_object is finalized before
    tp_proxy_pending_call_v0_take_pending_call is called, which seems unlikely
    but possible.

This happened 2 out of 3 times when running distcheck on MC 5.1.4 (but not when running the tests normally - a timing issue?), and seems to be fixed by using this telepathy-glib build.