Webfort currently compiles as a submodule of DFHack, much like stonesense.
It requires only minimal changes to the default DFHack release, which can be found at https://github.com/Alloyed/dfhack/tree/webfort.
To get a working copy:
git clone https://github.com/Alloyed/dfhack
git checkout webfort
git submodule update --init --recursive
Then you can follow the usual DFHack compiling process.
Below are extra notes which you should probably read.
On Windows, all Webfort dependencies are automatically installed by downloading and extracting this archive:
https://s3.amazonaws.com/webfort/webfort-deps-r1.tar.gz
This includes a number of Boost binaries, as well as SDL headers.
In my experience, Multilib support on Debian/Ubuntu is bad enough to make the linux container option suggested by upstream DFHack to be the only sane option.
Get a container by executing:
# lxc-create -t ubuntu -n dfhack -- --bindhome <USERNAME> -a i386
Where <USERNAME> is your username, and ubuntu is whichever distro you'd
like. Then boot into it, using the credentials of that user:
# lxc-start -n dfhack
Once there you can install the necessary dependencies for webfort:
# apt-get install libboost-system-dev libboost-regex-dev libasio-dev libsdl1.2-dev
In addition to everything you need for dfhack:
# apt-get install curl git build-essential cmake libxml-libxml-perl libxml-libxslt-perl
Then follow the usual instructions.