centos7 安装unixOdbc时提示 libltdl.so.7()(64bit) is needed

wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libtool-ltdl-2.4.2-22.el7_3.x86_64.rpm
rpm -ivh libtool-ltdl-2.4.2-22.el7_3.x86_64.rpm

安装上面这个包即可。