Ghostscript and Imagemagick

Installation

We can use Homebrew:

brew install ghostscript

Now before installing Imagemagick we should need:

brew install pkgconfig

If you need an older version of Imagemagick like the 6:

brew install imagemagick@6 \
--with-fftw \
--with-fontconfig \
--with-ghostscript \
--with-hdri \
--with-liblqr \
--with-librsvg \
--with-libwmf \
--with-little-cms \
--with-little-cms2 \
--with-opencl \
--with-openexr \
--with-openjpeg \
--with-openmp \
--with-pango \
--with-perl \
--with-webp \
--with-x11

We'll see an output like this:

==> Downloading https://homebrew.bintray.com/bottles/[e-mail]_sierra.bottle.tar.gz
Already downloaded: /Users/tony/Library/Caches/Homebrew/[e-mail]_sierra.bottle.tar.gz

This formula 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 this software first in your PATH run:
    echo 'export PATH="/usr/local/opt/imagemagick@6/bin:$PATH"' >> ~/.zshrc

So running echo 'export PATH="/usr/local/opt/imagemagick@6/bin:$PATH"' >> ~/.zshrc you will find convert in the path.

export PKG_CONFIG_PATH=/usr/local/opt/imagemagick@6/lib/pkgconfig