The latest MAGNET patch is contained in a file by the name:

magnet-<MAGNET version>-kernel-<kernel version>.patch

This patch installs the code for MAGNET version <version> into the
kernel version <kernel version> source tree. To apply, copy the MAGNET
patch file to the base (ie, /linux) directory of the kernel source
tree at enter the command:

patch -p1 < <magnet_patch_file_name>

This should apply the patch. Further documentation is found in
Documentation/magnet.txt and Documentation/magnet-install.txt after
the patch has been applied.

To create the MAGNET application programs, execute the following
in the /usr/src/linux/magnet directory.

make -f Makefile.tools