Definition of package management system in English English dictionary
The tool used by an operating system (OS) to administrate addition, removal and upgrade of software applications. Examples of package management systems on different OSes are: Linux: RPM; Solaris: pkgadd; HP-UX: SD-UX; Debian: apt-get; Win32: Windows Installer
If your system uses a package management system, you can query that system's database to see if the attr package and its associated library, libattr, are installed.