title: dbxtool on 64-bit linux won't load 64-bit version of dbx?
body: <p>I am using the Linux version of dbxtool to debug a 64-bit programme called frankie:</p>
  
  <pre><code>file ../support/frankie
  ../support/frankie: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.4, dynamically linked (uses shared libs), for GNU/Linux 2.6.4, not stripped
  </code></pre>
  
  <p>When I attempt to load the executable within dbxtool, I get an "unsupported architecture" message, which I assume means that the 32-bit version of dbx is loaded:</p>
  
  <pre><code>(dbx) debug ~/support/frankie
  dbx: ~/support/frankie has unsupported architecture or file format
  </code></pre>
  
  <p>However, if I run dbx from the commandline, it is able to load the file, presumably by automatically loading the 64-bit version of the debugger.</p>
  
  <pre><code>(dbx) debug ../support/frankie
  Reading frankie
  Reading ld-linux-x86-64.so.2
  Reading libm.so.6
  Reading libncurses.so.5
  Reading libc.so.6
  Reading libdl.so.2
  </code></pre>
  
  <p>I cannot find any option that would force dbxtool to use the 64-but debugger, in fact the only one I can find is one to force use of the 32-bit debugger in a 64-bit environment!</p>
  
  <p>any suggestions? </p>