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Package clang-3.3 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  clang-3.6:i386 clang-3.5:i386 clang-3.4:i386 clang:i386 clang-3.6 clang-3.5
  clang-3.4 clang