12.04 64安装intel fortran

[intel_fortran]

Ubuntu 12.04 64
安装l_fcompxe_2013.0.079.tgz
安装期间有个提示是
Missing optional pre-requisites
-- 32-bit libraries not found
不过忽略继续安装
安装成功后
提示ifort: command not found
之后

source /opt/intel/composer_xe_2013.0.079/bin/ifortvars.sh intel64
source /opt/intel/composer_xe_2013.0.079/bin/ifortvars.sh ia64
source /opt/intel/composer_xe_2013.0.079/bin/ifortvars.sh ia32
source /opt/intel/composer_xe_2013.0.079/bin/ifortvars.sh
source /opt/intel/composer_xe_2013.0.079/bin/compilervars.sh


都快气炸了
都试过

还是ifort: command not found
这东西怎么搞啊