These tools are used to control the key management system built into the Linux
kernel.
To build and install the tools and manual pages, run:
make
make install
If your glibc does not contain definitions for the new error codes and system
calls, then try:
make NO_GLIBC_KEYERR=1
The tools are licensed under the GPL and the utility library under the LGPL.
Copies of these are included in this tarball.