Object files for development using standard C libraries.

The glibc-devel package contains the object files necessary
for developing programs which use the standard C libraries (which are
used by nearly all programs). If you are developing programs which
will use the standard C libraries, your system needs to have these
standard object files available in order to create the
executables.

Install glibc-devel if you are going to develop programs which will
use the standard C libraries.