<p></p>
<p>When running the current master, the console will output the following: -</p>
<div class="highlight highlight-text-shell-session"><pre><span class="pl-c1">=> Booting Puma</span>
<span class="pl-c1">=> Rails 6.0.3.4 application starting in development</span>
<span class="pl-c1">=> Run `rails server --help` for more startup options</span>
<span class="pl-c1">pngcrush worker: `pngcrush` not found; please provide proper binary or disable this worker (--no-pngcrush argument or `:pngcrush => false` through options)</span>
<span class="pl-c1">advpng worker: `advpng` not found; please provide proper binary or disable this worker (--no-advpng argument or `:advpng => false` through options)</span>
<span class="pl-c1">optipng worker: `optipng` not found; please provide proper binary or disable this worker (--no-optipng argument or `:optipng => false` through options)</span>
<span class="pl-c1">pngquant worker: `pngquant` not found; please provide proper binary or disable this worker (--no-pngquant argument or `:pngquant => false` through options)</span>
<span class="pl-c1">jhead worker: `jhead` not found, `jpegtran` not found; please provide proper binary or disable this worker (--no-jhead argument or `:jhead => false` through options)</span>
<span class="pl-c1">jpegoptim worker: `jpegoptim` not found; please provide proper binary or disable this worker (--no-jpegoptim argument or `:jpegoptim => false` through options)</span>
<span class="pl-c1">jpegtran worker: `jpegtran` not found; please provide proper binary or disable this worker (--no-jpegtran argument or `:jpegtran => false` through options)</span>
<span class="pl-c1">gifsicle worker: `gifsicle` not found; please provide proper binary or disable this worker (--no-gifsicle argument or `:gifsicle => false` through options)</span>
<span class="pl-c1">svgo worker: `svgo` not found; please provide proper binary or disable this worker (--no-svgo argument or `:svgo => false` through options)</span>
<span class="pl-c1">Puma starting in single mode...</span>
<span class="pl-c1">* Version 5.0.4 (ruby 2.7.0-p0), codename: Spoony Bard</span>
<span class="pl-c1">* Min threads: 5, max threads: 5</span>
<span class="pl-c1">* Environment: development</span>
<span class="pl-c1">* Listening on http://127.0.0.1:3000</span>
<span class="pl-c1">* Listening on http://[::1]:3000</span>
<span class="pl-c1">Use Ctrl-C to stop</span></pre></div>
<p>according to <a href="https://github.com/toy/image_optim_rails/blob/master/README.markdown">image_optim_rails </a> documentation, another gem needs to be added, which will  get latest versions of most recent binaries for image_optim</p>
<div class="highlight highlight-source-ruby"><pre><span class="pl-en">gem</span> <span class="pl-s">'image_optim_pack'</span></pre></div>
<p>this will remove all of the errors except for one.</p>
<div class="highlight highlight-text-shell-session"><pre><span class="pl-c1">svgo worker: `svgo` not found; please provide proper binary or disable this worker (--no-svgo argument or `:svgo => false` through options)</span></pre></div>
<p>according to <a href="https://github.com/toy/image_optim/blob/master/README.markdown">image_optim</a> documentation, <code>pngout</code> and <code>svgo</code> binaries need to be installed separately (which they already are). so I just ended up switching gems from</p>
<div class="highlight highlight-source-ruby"><pre><span class="pl-en">gem</span> <span class="pl-s">'image_optim_pack'</span></pre></div>
<p>to</p>
<div class="highlight highlight-source-ruby"><pre><span class="pl-en">gem</span> <span class="pl-s">'image_optim'</span>
<span class="pl-en">gem</span> <span class="pl-s">'image_optim_pack'</span></pre></div>
<p>and that resolved the issue, so why not change to that gem? I'm willing to create a pull request if the maintainers approve of this change.</p>

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