kfreebsd-source-10.1 software package provides source code for kernel of FreeBSD 10.1 with Debian patches, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kfreebsd-source-10.1
kfreebsd-source-10.1 is installed in your system.
Make ensure the kfreebsd-source-10.1 package were installed using the commands given below,
$ sudo dpkg-query -l | grep kfreebsd-source-10.1 *
You will get with kfreebsd-source-10.1 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Kernels |
| Package | kfreebsd-source-10.1 |
| Version | 10.1~svn274115-4 |
| Description | source code for kernel of FreeBSD 10.1 with Debian patches |
| Sub Section | Kernels |