www/firefox31 build failure with gcc 4.9.2 on Solaris 10 sparc

[Ibraheem Saleh <shadowhawk100%gmail.com@localhost>]

I'm trying to build firefox31 with external gcc 4.9.2 on Solaris 10 sparc
and it's halting with the following error:

gmake[3]: Entering directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/glue/nomozalloc'
gmake[3]: Nothing to be done for `export'.
gmake[3]: Leaving directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/glue/nomozalloc'
gmake[3]: Entering directory `/usr/pkgsrc/www/firefox31/work/build/xpcom/base'
sed 's/.*ERROR(\([A-Z_0-9]*\),\( *\)\(.*\))[^)]*/#define \1
\2((nsresult)(\3))/' <
/usr/pkgsrc/www/firefox31/work/mozilla-esr31/xpcom/base/ErrorList.h >
ErrorListCDefines.h
../../dist/bin/nsinstall -R -m 644 'ErrorListCDefines.h' '../../dist/include'
echo '// IWYU pragma: private, include "nsError.h"' > ErrorListCxxDefines.h
sed -n 's/.*ERROR(\([A-Z_0-9]*\).*/#define \1 nsresult::\1/p' <
/usr/pkgsrc/www/firefox31/work/mozilla-esr31/xpcom/base/ErrorList.h >>
ErrorListCxxDefines.h
../../dist/bin/nsinstall -R -m 644 'ErrorListCxxDefines.h' '../../dist/include'
gmake[3]: Leaving directory `/usr/pkgsrc/www/firefox31/work/build/xpcom/base'
gmake[3]: Entering directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/components'
gmake[3]: Nothing to be done for `export'.
gmake[3]: Leaving directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/components'
gmake[3]: Entering directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/reflect/xptcall/src/md/unix'
gmake[3]: *** No rule to make target `xptcstubsdef_asm.solx86', needed
by `export'.  Stop.
gmake[3]: Leaving directory
`/usr/pkgsrc/www/firefox31/work/build/xpcom/reflect/xptcall/src/md/unix'
gmake[2]: *** [xpcom/reflect/xptcall/src/md/unix/export] Error 2
gmake[2]: Leaving directory `/usr/pkgsrc/www/firefox31/work/build'
gmake[1]: *** [export] Error 2
gmake[1]: Leaving directory `/usr/pkgsrc/www/firefox31/work/build'
gmake: *** [all] Error 2
*** Error code 2

Stop.
bmake: stopped in /usr/pkgsrc/www/firefox31
*** Error code 1

Any hints as to why this is breaking would be helpful :)

Thanks