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 .. _Installation:
 
 Installation
 ============
 
 Download
 --------
 
 A tar archive of the HEJ 2 source code can be downloaded and
 decompressed with the command::
 
   curl https://hej.hepforge.org/downloads?f=HEJ_2.2.tar.gz | tar -xz
 
 To obtain the latest stable HEJ version, `HEJ_2.2.tar.gz` should be
 replaced by `HEJ.tar.gz`.
 
 Alternatively, the HEJ source code can be obtained by installing the
 `git version control system <https://git-scm.com/>`_. and running:
 
 .. code-block:: sh
 
   git clone https://phab.hepforge.org/source/hej.git
 
 We also provide a `Docker image <https://hub.docker.com/r/hejdock/hej>`_
 containing a HEJ 2 installation (including the HEJ Fixed Order Generator).
 This image can be pulled with:
 
   docker pull hejdock/hej
 
 When using the Docker image the remaining installation steps can be
 skipped. In addition to working with Docker, these images will also work
-with
-`apptainer<https://apptainer.org/>`_/
-`singularity<https://docs.sylabs.io/guides/latest/user-guide/>`_.
+with `apptainer <https://apptainer.org/>`_/
+`singularity <https://docs.sylabs.io/guides/latest/user-guide/>`_.
 
 This comes with a caveat that you may need to source the software before
 running
 HEJ:
 
   source /cvmfs/pheno.egi.eu/HEJV2/HEJ_env.sh
 
 Users can also make use of the MPI libraries included in the images for
 efficient
 fixed order event generation for HEJ input using Sherpa which is configured
 with MPI support. Note that HEJ itself does not provide support for MPI.
 
 
 Prerequisites
 -------------
 
 Before installing HEJ 2, you need the following programs and
 libraries:
 
 - `CMake <https://cmake.org/>`_ version 3.1
 - A compiler supporting the C++17 standard, for example
   `gcc <https://gcc.gnu.org/>`_ 7 or later
 - `FastJet <http://fastjet.fr/>`_
 - `CLHEP <https://gitlab.cern.ch/CLHEP/CLHEP>`_ version 2.3
 - `LHAPDF <https://lhapdf.hepforge.org/>`_ version 6
 - The `IOStreams` and `uBLAS` `boost <https://www.boost.org>`_ libraries
 - `yaml-cpp <https://github.com/jbeder/yaml-cpp>`_
 - `autoconf` and `automake` for `FORM <https://github.com/vermaseren/form>`_
 
 In addition, some optional features have additional dependencies:
 
 - `Version 2 of QCDLoop <https://github.com/scarrazza/qcdloop>`_ is
   required to include finite top mass corrections in Higgs boson + jets
   production.
 - `HepMC versions 2 and 3 <https://hepmc.web.cern.ch/hepmc/>`_ enable
   event output in the respective format.
 - `Rivet <https://rivet.hepforge.org/>`_ version 3.1.4 or later
   together with HepMC 2 or 3 allow using Rivet analyses.
 - `HighFive <https://github.com/BlueBrain/HighFive>`_ has to be
   installed in order to read and write event files in the
   `HDF5 <https://www.hdfgroup.org/>`_-based format suggested in
   `arXiv:1905.05120 <https://arxiv.org/abs/1905.05120>`_.
 
 We strongly recommend to install these programs and libraries to
 standard locations:
 
 - The executable files should be inside one of the directories listed in
   the `PATH` environment variable. This concerns `cmake`, the C++
   compiler, and the executables contained in `autoconf` and
   `automake`.
 
 - The library header files ending with `.h`, `.hh`, or `.hpp` should be
   in a directory where they are found by the C++ compiler. For `gcc`
   or `clang`, custom locations can be specified using the
   `CPLUS_INCLUDE_PATH` environment variable.
 
 - The compiled library files ending with `.a`, `.so`, or `.dylib`
   should be in a directory where they are found by the linker. Custom
   locations can be set via the `LIBRARY_PATH` environment
   variable. For shared object libraries (`.so` or `.dylib`) custom
   locations should also be part of `LD_LIBRARY_PATH` on linux and
   `DYLD_FALLBACK_LIBRARY_PATH` or `DYLD_LIBRARY_PATH` on macOS.
 
 Compilation
 -----------
 
 To compile and install HEJ 2 run::
 
   cmake source/directory -DCMAKE_INSTALL_PREFIX=target/directory
   make install
 
 :file:`source/directory` is the directory containing the file
 :file:`CMakeLists.txt`. If you omit
 :code:`-DCMAKE_INSTALL_PREFIX=target/directory` HEJ 2 will be
 installed to some default location.
 
 In case some of the aforementioned prerequisites are not found by
 :code:`cmake` you can give a hint by adding an additional argument
 :code:`-Dlibname_ROOT_DIR=/directory/with/library`, where
 :code:`libname` should be replaced by the name of the library in
 question. For example, if `FastJet` is installed in the subdirectory
 `.local` of your home directory with the `libfastjet.*` library files
 in `.local/lib` and the header files ending with `.hh` in
 `.local/include/fastjet` you can pass
 :code:`-Dfastjet_ROOT_DIR=$HOME/.local` to `cmake`.
 
 If :code:`cmake` fails to find (the correct) boost path,
 try setting :code:`-DBOOST_ROOT=/path/to/boost`, this will force
 :code:`cmake` to search for boost only in :code:`/path/to/boost`.
 
 To not include specific packages one can add
 :code:`-DEXCLUDE_packagename=TRUE` to :code:`cmake`, e.g. by
 setting :code:`-DEXCLUDE_rivet=TRUE` HEJ 2 will not be interfaced
 to Rivet even if it is available on the system.
 
 Testing
 -------
 
 To test your installation, download the NNPDF 2.3 PDF set with::
 
   lhapdf install NNPDF23_nlo_as_0119
 
 and run::
 
   make test
 
 The test data of HEJ are stored in a
 `Git Large File Storage <https://git-lfs.github.com/>`_ format.
 :code:`git clone` therefore requires :code:`git-lfs` to download the data
 correctly.