kfreebsd-source-8.3 software package provides source code for kernel of FreeBSD 8.3 with Debian patches, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kfreebsd-source-8.3
kfreebsd-source-8.3 is installed in your system.
Make ensure the kfreebsd-source-8.3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep kfreebsd-source-8.3 *
You will get with kfreebsd-source-8.3 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Kernels |
| Package | kfreebsd-source-8.3 |
| Version | 8.3-6+deb7u1 |
| Description | source code for kernel of FreeBSD 8.3 with Debian patches |
| Sub Section | Kernels |