Installation of PyImfit ======================= Note that since PyImfit is only meant to work with Python 3 (specifically, version 3.5 or later on Linux and version 3.6 or later on macOS), I reference ``pip3`` instead of just ``pip`` in the example installation commands below. If your version of ``pip`` automatically installs into Python 3, then you don’t need to explicitly specify ``pip3``. Standard Installation: macOS ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A precompiled Intel (x86-64) binary version (“wheel”) of PyImfit for macOS can be installed from PyPI via ``pip``: :: $ pip3 install pyimfit PyImfit requires the following Python libraries/packages (which will automatically be installed by ``pip`` if they are not already present): - Numpy - Scipy Astropy is also useful for reading in FITS files as numpy arrays (and is required by the unit tests). Installation on Apple Silicon (e.g., M1, M2) Macs ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ At present, the precompiled version of PyImfit is an x86-64 (“Intel”) binary. This will not work with arm64 (Apple Silicon, including M1 and M2 chips) versions of Python. However, you *can* run PyImfit on an arm64-based Mac by running an x86-64 version of Python. How you do this depends on how you prefer to install and use Python (e.g., python.org installers vs conda vs Homebrew); there are various suggestions available online for how to do this, depending on how you prefer to install Python. (The plan is to have a future release of PyImfit that natively supports arm64 as well as x86-64.) Standard Installation: Linux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ PyImfit can also be installed on Linux using ``pip``. Since this involves building from source, you will need to have a working C++-11-compatible compiler (e.g., GCC version 4.8.1 or later); this is probably true for any reasonably modern Linux installation. (**Note:** a 64-bit Linux system is required.) :: $ pip3 install pyimfit [or "pip3 install --user pyimfit", if installing for your own use] If the installation fails with a message containing something like “fatal error: Python.h: No such file or directory”, then you may be missing headers files and static libraries for Python development; see `this Stackexchange question `__ for guidance on how to do that.