Anaconda based Build, All Platforms

Note that even with a source build it may be difficult to get this working on systems with very old operating system installs. We normally try to support OS versions 6-7 years old. Please report any problems.

Mac OS X, Linux

Download and install Miniconda2 or Anaconda2.
1. Miniconda2 (<30MB): Minimal installer that contains conda and Python. Ideal for cluster installations and if you need conda only for EMAN2.
2. Anaconda2 (270-350 MB): Entire Anaconda distribution, open data science platform powered by Python. Includes packages like Jupyter, Spyder, Anaconda Navigator.

Checkout EMAN2 code from GitHub:cryoem/eman2.

cd <some-path-to-keep-eman2-source>
git clone https://github.com/cryoem/eman2.git

Install dependencies. Follow only one of the steps below:
1. This option installs EMAN2 dependencies into a conda environment. It requires running the second command in each shell before trying to run EMAN2/SPARX/SPHIRE commands.
```
conda create -n eman-env eman-deps -c cryoem -c defaults -c conda-forge
source activate eman-env
```
2. This option is easier, and doesn't use an environment. It will work with Miniconda, but will not work with Anaconda versions 4.2.0 (2016-09-28) and newer, because the bundled Qt version was upgraded from version 4 to 5.
```
conda install eman-deps -c cryoem -c defaults -c conda-forge          # Mac OSX
conda install eman-deps=*=np18* -c cryoem -c defaults -c conda-forge  # Linux
```
  Listing the channels explicitly can be avoided by specifying them in $HOME/.condarc, see conda documentation for more details, https://conda.io/docs/using/index.html.
Out-of-source builds are recommended, so work in a directory outside of eman2 source (this is a recommended practice in general, not EMAN2-specific). Note cmake, not ccmake . CMake will automatically find the dependencies. If you want to change any of the CMake values, then use cmake-gui or ccmake.
```
cd <build-directory>
cmake <some-path-to-keep-eman2-source>
```
If conda is not found in PATH, set CONDA_ROOT to your conda environment directory. It could be the main installation or an environment.
If you set CONDA_ROOT to an environment, make sure to delete any cmake variables that cmake already found, variables like EMAN_INSTALL_PREFIX, EMAN_PREFIX, *_LIBRARY or similar, *_INCLUDE_PATH or similar.

Rerun cmake and continue with make.

cmake <some-path-to-keep-eman2-source>
make -j           # "make" should pick up the number of available processors,
make -j4          # but you may specify the number if you like
make install