lib/49341: assertion "pthread__tsd_descructors[key] != NULL" failed

[andrew.cagney%gmail.com@localhost]

>Number:         49341
>Category:       lib
>Synopsis:       assertion "pthread__tsd_descructors[key] != NULL" failed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 30 17:45:00 +0000 2014
>Originator:     Andrew Cagney
>Release:        7.0_BETA GENERIC.201410252300Z pkgsrc HEAD
>Organization:
>Environment:
7.0_BETA GENERIC.201410252300Z amd64
>Description:
cd pkgsrc/*/gnome
make install

[wait several days]

assertion "pthread__tsd_descructors[key] != NULL" failed
file "/usr/src/lib/libpthread/pthread_tsd.c"
line 136
function "pthread__add_specific"

(forgive the typos)

build hangs (was in one of the mono directories)
>How-To-Repeat:
see above, however, I'm not sure it is practical
>Fix: