# Install directions¶

This section covers the basics of how to download and install TomoPy.

## Supported Operating Systems¶

Since most of the developers use Unix systems (Linux and macOS), TomoPy is only tested and officially supported on Unix systems. Windows installation and functionality is not guaranteed.

## Installing from source with Conda¶

Sometimes an adventurous user may want to get the source code, which is always more up-to-date than the one provided by Conda (with more bugs of course!).

For this you need to get the source from the TomoPy repository on GitHub. Download the source to your local computer using git by opening a terminal and running:

$git clone https://github.com/tomopy/tomopy.git  in the folder where you want the source code. This will create a folder called tomopy which contains a copy of the source code. ### Installing dependencies¶ You will need to install all the dependencies listed in requirements.txt or meta.yaml files. For example, requirements can be installed using Conda by running: $ conda install --file requirements.txt


After navigating to inside the tomopy directory, you can install TomoPy by activating the Conda base environment and running the install script:

$source activate (base)$ python setup.py install


Activating the conda environment ensures that setup.py will know where to look for the mkl headers. If you didn’t use Conda to install the mkl library, you may need to read the section below.

### Common issues¶

The following error from gcc states that it cannot find the mkl header file it needs to compile the c extensions of TomoPy:

src/gridrec.c:56:21: fatal error: mkl.h: No such file or directory


You will need to add the location of your mkl header file to the C_INCLUDE_PATH by setting an environmental variable or changing line 30 of setup.py

If you installed mkl-devel using conda, the header files should be located in the foo/conda/include directory where foo is the install location of conda on your computer. By default this folder is your Home directory.

## Importing TomoPy¶

When importing, it is best to import TomoPy before importing numpy. See this thread for details.