Пакет glibc: Информация

The GNU C library defines all of the library functions that are specified
by the ISO C standard, as well as additional features specific to POSIX
and other derivatives of the Unix operating system, and extensions
specific to the GNU system.

The GNU libc is a set of standard libraries which are used by multiple
programs on the system.  In order to save disk space and memory, as well
as to make upgrading easier, common system code is kept in one place
and shared between programs.