Last revision not found

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ruby …/…/…/…/svn/ruby/trunk/tool/file2lastrev.rb --revision.h
“…/…/…/…/svn/ruby/trunk” >
“…/…/…/…/svn/ruby/trunk/revision.h.tmp”
svn: ‘.’ is not a working copy
…/…/…/…/svn/ruby/trunk/tool/file2lastrev.rb:34:in `get_revisions’:
last revision not found (RuntimeError)
from …/…/…/…/svn/ruby/trunk/tool/file2lastrev.rb:70
make: *** […/…/…/…/svn/ruby/trunk/revision.h] Error 1

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