问题一：
今天准备升级到firefox-3.6.4，在编译xulrunner-1.9.2.4时出现下面的错误：

./../../dist/bin/js: /usr/lib/libstdc++.so.6: version `CXXABI_1.3' not found (required by ./../../dist/bin/js)
./../../dist/bin/js: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4' not found (required by ./../../dist/bin/js)
make[3]: *** [libs] Error 1
make[3]: Leaving directory `/var/tmp/portage/net-libs/xulrunner-1.9.2.4/work/mozilla-1.9.2/js/src'
make[2]: *** [libs_tier_js] Error 2
make[2]: Leaving directory `/var/tmp/portage/net-libs/xulrunner-1.9.2.4/work/mozilla-1.9.2'
make[1]: *** [tier_js] Error 2
make[1]: Leaving directory `/var/tmp/portage/net-libs/xulrunner-1.9.2.4/work/mozilla-1.9.2'
make: *** [default] Error 2
 * ERROR: net-libs/xulrunner-1.9.2.4 failed:

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