I'm not the author of prevu, but I believe this is a feature, not a bug.
If prevu automatically backported build dependencies, you might end up
replacing several critical core packages and break your system.  Prevu
requires a user to manually backport any required build dependencies,
and this has the effect of forcing the user to really think about
whether it is safe to do so.

There may be another reason prevu does not automatically backport build
dependencies:  simplicity.  Writing code to detect unsatisfied build
dependencies may not be trivial, and the author may not have had time to
implement such a feature.  You may want to file a wishlist bug
requesting such a feature.

In your specific case, notice lines 311-312 in your log file:

    The following packages have unmet dependencies:
      pbuilder-satisfydepends-dummy: Depends: libx11-xcb-dev which is a virtual 
package.

You can try running "prevu libx11-xcb-dev" to backport this particular
build dependency.  Be sure to follow that by "sudo prevu-update" in
order to make prevu aware of your backport.  If you need additional
help, see the prevu forum thread at
http://ubuntuforums.org/showthread.php?t=268687

** Changed in: prevu (Ubuntu)
       Status: New => Invalid

-- 
Prevu fails to build compiz
https://bugs.launchpad.net/bugs/198639
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