regression: firefox4 fails to build on ia64

[Anton Shterenlikht]

I'm updating from firefox 3.6.15 to 4.01 on ia64 -current.
I get this error:

c++ -o jsdtoa.o -c  -fvisibility=hidden -DOSTYPE=\"FreeBSD9\" -DOSARCH=FreeBSD -DEXPORT_JS_API -D__S
TDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -DJS_HAS_CTYPES -DDLL_PREFIX=\"lib\" -DDLL_SUFFIX=\".so\"
-DFREEBSD -Ictypes/libffi/include -I.  -I. -I. -I./../../dist/include -I./../../dist/include/nsprpub
 -I/usr/local/include  -I/usr/local/include/nspr   -I. -I./assembler -I./yarr  -fPIC -I/usr/local/in
clude -fno-rtti -fno-exceptions -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-pr
ivacy -Wno-non-virtual-dtor -Wno-invalid-offsetof -Wno-variadic-macros -Werror=return-type -pipe -g
-fno-strict-aliasing -pipe  -DDEBUG -D_DEBUG -DTRACING -g -O3 -fstrict-aliasing -fomit-frame-pointer
 -DUSE_SYSTEM_MALLOC=1 -DENABLE_ASSEMBLER=1 -DENABLE_JIT=1  -I/usr/local/include -DMOZILLA_CLIENT -i
nclude ./js-confdefs.h jsdtoa.cpp
jsdbgapi.cpp: In function 'bool CompartmentHasLiveScripts(JSCompartment*)':
jsdbgapi.cpp:131: error: 'currentThreadId' was not declared in this scope
gmake[3]: *** [jsdbgapi.o] Error 1
gmake[3]: *** Waiting for unfinished jobs....
gmake[3]: Leaving directory `/usr/ports/www/firefox/work/mozilla-2.0/js/src'
gmake[2]: *** [libs_tier_js] Error 2
gmake[2]: Leaving directory `/usr/ports/www/firefox/work/mozilla-2.0'
gmake[1]: *** [tier_js] Error 2

My bug report:
https://bugzilla.mozilla.org/show_bug.cgi?id=647830

Please advise

Many thanks
Anton

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423