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:

问题二：在firefox里一旦打开含有FLASH的网页FF就崩溃~~~
使用命令行打开firefox查看，可以看到只要打开含有FLASH的网页，终端里错误信息如下：

/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `CXXABI_1.3' not found (required by /usr/lib/xulrunner-1.9.2/libxul.so)
/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4' not found (required by /usr/lib/xulrunner-1.9.2/libxul.so)
/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `CXXABI_1.3' not found (required by /usr/lib/xulrunner-1.9.2/libmozjs.so)
/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4' not found (required by /usr/lib/xulrunner-1.9.2/libmozjs.so)
/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `CXXABI_1.3' not found (required by /usr/lib/libhunspell-1.2.so.0)
/usr/lib/xulrunner-1.9.2/plugin-container: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4' not found (required by /usr/lib/libhunspell-1.2.so.0)

可以看出，二者的问题都在于xulrunner需要libstdc++.so.6中CXXABI_1.3和GLIBCXX_3.4

ls -l /usr/lib/libstdc++.so.6一看，好家伙，原来/usr/lib/libstdc++.so.6链接到了一个莫名其妙的文件上，自然会出错了，修改/usr/lib/libstdc++.so.6的软链接到/usr/lib/gcc/i686-pc-linux-gnu/4.4.4/libstdc++.so.6（根据你的CHOST和GCC版本的不同这里路径可能有一些区别）后，两个问题解决