liblockfile is installed with CentOS 7 and it gets updated by EPEL 7. Is that supposed to happen? # yum info liblockfile Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: centos.mirror.constant.com * epel: mirrors.mit.edu * extras: centos.mirror.constant.com * updates: centos.mirror.constant.com Installed Packages Name : liblockfile Arch : x86_64 Version : 1.08 Release : 18.el7 Size : 38 k Repo : installed Summary : This implements a number of functions found in -lmail on SysV : systems URL : http://packages.qa.debian.org/libl/liblockfile.html License : GPLv2+ and LGPLv2+ Description : This library implements a number of functions found in -lmail on : SysV systems. These functions are designed to lock the standard : mailboxes in /var/mail (or wherever the system puts them). : : In additions, this library adds a number of functions to create, : manage and remove generic lockfiles. Available Packages Name : liblockfile Arch : i686 Version : 1.08 Release : 17.el7 Size : 21 k Repo : base/7/x86_64 Summary : This implements a number of functions found in -lmail on SysV : systems URL : http://packages.qa.debian.org/libl/liblockfile.html License : GPLv2+ and LGPLv2+ Description : This library implements a number of functions found in -lmail on : SysV systems. These functions are designed to lock the standard : mailboxes in /var/mail (or wherever the system puts them). : : In additions, this library adds a number of functions to create, : manage and remove generic lockfiles.