Installing the development version

The current development version of the code can be downloaded as source tarballs or directly from the Git repository.

The current GammaLib development release is

Source tarball

Download the source tarball from the following link

and follow the instructions on Installation from source code.

Git repository

To clone the gammalib source code, type

$ git clone

This will create a directory named gammalib under the current working directory that will contain the gammalib source code. In case that the cloning does not work you may try adding

$ export GIT_SSL_NO_VERIFY=true


$ git config --global http.sslverify "false"

before retrieving the code. Before you will be able to compile the code you need to generate the configuration file using the script. Also make sure that you’re actually on the devel branch of the git repository. GammaLib can be compiled and configured using the following command sequence (the code will be installed into the /usr/local/gamma directory):

$ cd gammalib
$ git checkout devel
$ ./
$ ./configure
$ make
$ make check
$ sudo make install
$ export GAMMALIB=/usr/local/gamma
$ source $GAMMALIB/bin/

Please read the Installation from source code section if you need more information on how to install GammaLib.


You need swig on your system to build the Python wrappers when you get the code from Git. Python wrappers are not stored in the Git repository but are built using swig from interface files located in the pyext folder. However, you do not need swig when fetching a release as the Python wrappers are bundled with the release tarballs.

Making a conda package

To create a conda package for the development version, clone the gammalib source code using

$ git clone

and type the following to create the conda packages (make sure that anaconda is included in your $PATH environment):

$ cd gammalib
$ git checkout devel
$ ./
$ ./configure
$ conda-build dev/conda.recipe

Once this is done, you can create a conda environment using the development version as follows:

$ conda create -n gammalib-devel python=3.6
$ source activate gammalib-devel
$ conda install --use-local

Note that you can chose between Python 2.7, 3.5, 3.6, 3.7 and 3.8 for your conda environment.