That may be possible to do this way but I only know the other way around. First you have to set up the normal darktable build chain. As you want a one shot build you can do this:
$ git clone https://github.com/darktable-org/darktable.git
$ cd darktable
$ mkdir build
$ cd build
$ cmake -DCMAKE_INSTALL_PREFIX=/opt/darktable_or_what_you_want ../.
$ sudo make install
This should give you a running darktable master branch. Then, you grab the jandren’s work:
$ git remote add jandren https://github.com/jandren/darktable.git
$ git fetch jandren
$ git checkout -b sigmoid_tone_mapping --track jandren/sigmoid_tone_mapping
$ git rebase master
$ sudo make install
EDIT: I’ve forgotten the usual submodules before the cmake:
$ git submodule init
$ git submodule update