Index: head/www/firefox/files/patch-python_futures_concurrent_futures_process.py
===================================================================
--- head/www/firefox/files/patch-python_futures_concurrent_futures_process.py	(nonexistent)
+++ head/www/firefox/files/patch-python_futures_concurrent_futures_process.py	(revision 438796)
@@ -0,0 +1,15 @@
+--- python/futures/concurrent/futures/process.py.orig	2017-04-11 04:15:19 UTC
++++ python/futures/concurrent/futures/process.py
+@@ -247,7 +247,11 @@ def _check_system_limits():
+     _system_limits_checked = True
+     try:
+         import os
+-        nsems_max = os.sysconf("SC_SEM_NSEMS_MAX")
++        if sys.platform.startswith('freebsd'):
++            # sem(4) confuses sysconf(3) on FreeBSD < 11.1
++            nsems_max = -1
++        else:
++            nsems_max = os.sysconf("SC_SEM_NSEMS_MAX")
+     except (AttributeError, ValueError):
+         # sysconf not available or setting not available
+         return

Property changes on: head/www/firefox/files/patch-python_futures_concurrent_futures_process.py
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Added: fbsd:nokeywords
## -0,0 +1 ##
+yes
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Added: svn:eol-style
## -0,0 +1 ##
+native
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Added: svn:mime-type
## -0,0 +1 ##
+text/plain
\ No newline at end of property