The glibc-devel package contains the header and 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 header and object files available in order to create the
executables.

This package also includes the C header files for the Linux kernel.
The header files define structures and constants that are needed for
building most standard programs. The header files are also needed for
rebuilding the kernel.

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