title: Install wkhtmltopdf in a Mac in order to be used by imgkit gem in RoR
body: <p>I am trying to use IMGKit gem. 
  So I need to install wkhtmtopdf software. </p>
  
  <p>The following command doesn't work: sudo imgkit --install-wkhtmltoimage   , so I am trying to install it manually.</p>
  
  <p>I downloaded two versions for Mac: one is a .i386 file and the other are 4 .dylib files.</p>
  
  <p>How can I install any of them? 
  Why they dont have a normal installer?</p>