Compiling Firefox, Seamonkey, Thunderbird fails

[Bob Melson]

System:
FreeBSD strider.homeunix.net 9.3-STABLE FreeBSD 9.3-STABLE #37 r290542: 
Sun Nov  8 13:27:53 MST 2015 
root at strider.homeunix.net:/usr/obj/usr/src/sys/STRIDER  amd64

Failure message: (Firefox; others fail similarly)
/usr/ports/www/firefox/work/firefox-42.0/config/recurse.mk:32: recipe 
for target 'compile' failed
gmake[3]: *** [compile] Error 2
gmake[3]: Leaving directory 
'/usr/ports/www/firefox/work/firefox-42.0/obj-x86_64-portbld-freebsd9.3'
/usr/ports/www/firefox/work/firefox-42.0/config/rules.mk:549: recipe for 
target 'default' failed
gmake[2]: *** [default] Error 2
gmake[2]: Leaving directory 
'/usr/ports/www/firefox/work/firefox-42.0/obj-x86_64-portbld-freebsd9.3'
/usr/ports/www/firefox/work/firefox-42.0/client.mk:401: recipe for 
target 'realbuild' failed
gmake[1]: *** [realbuild] Error 2
gmake[1]: Leaving directory '/usr/ports/www/firefox/work/firefox-42.0'
/usr/ports/www/firefox/work/firefox-42.0/client.mk:171: recipe for 
target 'build' failed
gmake: *** [build] Error 2
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** [do-build] Error code 1

Stop in /usr/ports/www/firefox.
*** [stage] Error code 1

Stop in /usr/ports/www/firefox.

 From /usr/ports/UPDATING:

20151006:
   AFFECTS: users of www/firefox, www/seamonkey
   AUTHOR: gecko at FreeBSD.org

   Firefox since 41.0 and SeaMonkey since 2.38 require databases/sqlite3
   port built with DBSTAT option enabled (default). Re-run "make config"
   if the port(s) fail to build as described in ports/200853.

Over the past several months (at least 6), each time there's been an 
update to Firefox/Seamonkey/Thunderbird, my compiles have failed, always 
with a message similar to the above and in each of the three mozilla 
"products".  The above information applies to Firefox, but the other two 
also fail to compile, with similar messages.

I've looked at ports/200853 and have to admit that I *really* don't 
understand what I must do beyond compiling/installing sqlite3 with the 
DBSTAT option enabled.

Granted, I've eventually - within several days of each upgrade's 
appearance - been able to pull down the appropriate package(s).  Still, 
I prefer to roll my own.

So, can anybody please ease my frustration - and end my cluelessness! - 
  at these repeated failures by providing a suitable clue that would 
allow me to once again be able to compile these applications?

Thanks,
Bob Melson

-- 
Robert G. Melson | Rio Grande Microsolutions | El Paso, TX
--
The world will not be destroyed by those who do evil, but by
those who watch and do nothing.  Albert Einstein