This tutorial is based upon the assumption that you have installed GNS3 under /opt/GNS3, Please check here http://www.gns3.net/phpBB/topic2216.html
First I'll show you Qemu Patch/Compilation part .
First we'll have to install dependencies
[user@admin ~]$ su
Password: (Type in your root password here)
[root@admin /]# yum install ncurses ncurses-devel zlib zlib-devel SDL SDL-devel libpcap libpcap-devel
Let's download and compile Qemu
[root@admin /]#cd /opt/GNS3/
[root@admin GNS3]#wget http://download.savannah.gnu.org/releases/qemu/qemu-0.11.0.tar.gz
[root@admin GNS3]#tar xvzf qemu-0.11.0.tar.gz
[root@admin GNS3]#cd qemu-0.11.0
[root@admin qemu-0.11.0]#wget http://downloads.sourceforge.net/gns-3/qemu-0.11.0-olive.patch?download
[root@admin qemu-0.11.0]#patch -p1 -i qemu-0.11.0-olive.patch
[root@admin qemu-0.11.0]#./configure --target-list=i386-softmmu
[root@admin qemu-0.11.0]#make
[root@admin qemu-0.11.0]#make install
Read More
http://networkingtips-tricks.blogspot.com/2010/09/emulate-asa-in-gns3-on.html
