[Haskell-cafe] build failure on Hackage

I maintain a library that, on Linux, needs libXxf86vm to build. The server where Hackage runs doesn't have that library, so the build fails. I think this is reasonable -- that box can't possibly have all the libraries various packages might need. But the build failure seems to cause the Haddock docs to not be generated. Why? My understanding is, if someone specifies my library as a build dependency, my library's build failure will also cause the docs for their package not to be built. I think my library will kill the Hackage Haddock docs for any other package that depends on it, due to a build error that's not even meaningful. What can I do?