| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see [crypto/README](crypto/README)). |
| etc | Template files for /etc. |
-| gnu | Source code for third-party software under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see [gnu/COPYING](gnu/COPYING) and [gnu/COPYING.LIB](gnu/COPYING.LIB) for more information. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |