title: What version of libraries to link against in a kext's OSBundleLibraries?
body: <p>I ran <code>kextlibs</code> against my kext, and it told me to use:</p>
  
  <pre><code>com.apple.kpi.bsd = 12.2
  com.apple.kpi.libkern = 12.2
  </code></pre>
  
  <p>this runs fine on my development machine (10.8). But when I run it on another machine (running 10.7) it doesn't load, saying:</p>
  
  <pre><code>Dependency Resolution Failures: 
  Only incompatible kexts found for these libraries: 
      com.apple.kpi.bsd
      com.apple.kpi.libkern
  </code></pre>
  
  <p>How do I work out which versions to link against if I want to target a range of Mac OS versions (10.6 to 10.8)?</p>