Hi,

My Linux package manager supports building packages from svn, but it
exports the files into a sandbox directory prior to building. This causes
'svn info' to fail in the R build process. (It would probably be cleaner
for R to record the svn revision in an svn hook, but that's besides the
point). Before October, the unknown revision was indicated by the "unknown"
string, and biocLite would emit a warning (but not an error). Since
October, the data type of the R_SVN_REVISION has changed to integer, and
unknown is indicated by -99. Could this be added to the check in
BiocInstaller?

Thanks,
Michael

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