title: PHP 5.6 Mcrypt x64 and MIT Scheme not compatible?
body: <p>I have PHP 5.6 <code>PHP 5.6.17-1+deb.sury.org~trusty+2 (cli)</code> installed currently, on Mint 17.2 x64 (Cinnamon). If I try to install <code>mit-scheme</code>, I get:</p>
  
  <p><code>
  sudo apt-get install mit-scheme
  Reading package lists... Done
  Building dependency tree<br>
  Reading state information... Done
  The following packages were automatically installed and are no longer required:
    dbconfig-common libjs-codemirror libjs-jquery-cookie libjs-jquery-event-drag
    libjs-jquery-metadata libjs-jquery-mousewheel libjs-jquery-tablesorter
    libjs-jquery-ui php-gettext
  Use 'apt-get autoremove' to remove them.
  The following extra packages will be installed:
    libmcrypt4:i386 libmhash2:i386 libpq5:i386
  Suggested packages:
    libmcrypt-dev:i386 mcrypt:i386 mit-scheme-dbg:i386
  The following packages will be REMOVED:
    libmcrypt-dev libmcrypt4 mcrypt php5-mcrypt phpmyadmin
  The following NEW packages will be installed:
    libmcrypt4:i386 libmhash2:i386 libpq5:i386 mit-scheme:i386
  0 upgraded, 4 newly installed, 5 to remove and 38 not upgraded.
  Need to get 6,668 kB of archives.
  After this operation, 5,040 kB disk space will be freed.
  </code></p>
  
  <p>Seems the problem is between <code>libmcrypt4</code> and <code>libmcrypt4:i386</code>. Is there not an x64 version of Scheme, or a way to keep those two <code>mcrypt</code> versions from interfering with each other? Best (of poor) options looks like installing Scheme in a 32bit virtual machine. Another option is compiling PHP from a 32 bit source, if that is possible on a 64bit machine. Anyone else run into this issue?</p>