How to compile Firefox on Solaris?

I would like to compile Firefox 0.9.3 on Solaris 8/SPARC using Sun
Forte 6 update 2 compiler suite with fairly recent patches. Is this
configuration supported?  If I compile Firefox on the same machine
using gcc 3.4.1, it works fine. However, the Sun Forte build has some
strange problems. When I run ./firefox, it just sits there and then
exits a few seconds after with no errors printed. It also does
something to my .mozilla and .firefox directories so that the working
gcc firefox build does not work after that unless I remove those
directories.  Here is my .mozconfig file:

ac_add_options --disable-tests
ac_add_options --disable-debug
ac_add_options --disable-freetype2
ac_add_options --without-system-nspr
ac_add_options --without-system-zlib
ac_add_options --without-system-jpeg
ac_add_options --without-system-png
ac_add_options --without-system-mng
ac_add_options --enable-optimize="-xO2"
ac_add_options --enable-official-branding
ac_add_options --enable-xinerama
mk_add_options CC=cc
mk_add_options CXX=CC
mk_add_options BUILD_OFFICIAL=1
mk_add_options MOZILLA_OFFICIAL=1
mk_add_options MOZ_OBJDIR=/tmp/firefox
BUILD_OFFICIAL=1
MOZILLA_OFFICIAL=1
CC=cc
CXX=CC
 
 
# This file specifies the build flags for Firefox.  You can use it by adding:
#  . $topsrcdir/browser/config/mozconfig
# to the top of your mozconfig file.
 
MOZ_PHOENIX=1
mk_add_options MOZ_PHOENIX=1
 
ac_add_options --disable-ldap
ac_add_options --disable-mailnews
ac_add_options --enable-extensions=cookie,xml-rpc,xmlextras,pref,transformiix,universalchardet,typeaheadfind,webservices,inspector,gnomevfs,negotiateauth
ac_add_options --enable-crypto
ac_add_options --disable-composer
ac_add_options --enable-single-profile
ac_add_options --disable-profilesharing