Install package imager in ubuntu or MacOSX (with imagemagick library)

In terminal:

sudo apt-get update -y
sudo apt-get install -y fftw3

In R
install.packages("imager")

More infos here:
http://dahtah.github.io/imager/

In MacOSX: 

brew install imagemagick ffmpeg

Note:

imagemagick@6 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.

If you need to have imagemagick@6 first in your PATH, run:
  echo 'export PATH="/usr/local/opt/imagemagick@6/bin:$PATH"' >> ~/.zshrc

For compilers to find imagemagick@6 you may need to set:
  export LDFLAGS="-L/usr/local/opt/imagemagick@6/lib"
  export CPPFLAGS="-I/usr/local/opt/imagemagick@6/include"

For pkg-config to find imagemagick@6 you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/imagemagick@6/lib/pkgconfig"

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