Fix clang detection on Xcode 4.6+.
Thanks to danielj.
Sync from distribution
Fix POD
Update docs
Leave markdown docs out of tarball.
Support 10.8.3
Backport doc changes from branch_0_34
Saw a bug report where the user happened to have a 12.x.1 kernel.
Workaround for tar hanging when running as root.  Thanks to Peter Dyballa for the suggestion.
Update NEWS for 0.34.7
Doc updates
Sync with the distribution.
Updated in the distribution.  Fortunately the lack of BuildConflicts: gcc4N doesn't affect bootstrap.
Explicit quoting for heredoc syntax

Perl is getting stricter about parsing the terminator token. May as
well be clear about interpolation and the token itself, and also to
prevent diagnostic messages or mis-processing in the future in case
perl gets even stricter.