centos7升级qemu-kvm，源码

rule

　　先卸载qemu-kvm
　　yum –y remove qemu-kvm
　　源码地址：http://wiki.qemu.org/Download
　　下载源码
　　wget http://wiki.qemu-project.org/download/qemu-2.8.0-rc0.tar.bz2
　　安装依赖包
　　yum -y install gcc gcc-c++ automake libtool zlib-devel glib2-devel bzip2-devel libuuid-devel spice-protocol spice-server-devel usbredir-devel libaio-devel
　　编译安装
　　tar xf qemu-2.8.0.tar.bz2
　　cd qemu-2.8.0
　　./configure --enable-usb-redir --enable-libusb --enable-spice --enable-uuid --enable-kvm --enable-bzip2 --prefix=/usr/local/qemu --enable-linux-aio --enable-system
　　make && make install
　　编译完成之后 做链接
　　# ln -s /usr/local/qemu/bin/qemu-system-x86_64 /usr/bin/qemu-kvm
　　# ln -s /usr/local/qemu/bin/qemu-system-x86_64 /usr/libexec/qemu-kvm
　　# ln -s /usr/local/qemu/bin/qemu-img /usr/bin/qemu-img
　　查看当前qemu版本,可以看到当前版本为2.8
　　qemu-img  --version
　　qemu-kvm –version
　　编译过程遇到的错误
　　cd /home/src/qemu-2.8.0/pixman; autoreconf -v --install)/bin/sh: autoreconf: command not found
make: ***[/home/src/qemu-2.8.0/pixman/configure] Error 127
　　解决方法： yum–y install automake
　　configure.ac:75:error: possibly undefined macro: AC_PROG_LIBTOOL
If this token and others are legitimate, pleaseuse m4_pattern_allow.
See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exitstatus: 1
　　解决方法 yum –y installlibtool