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# make snapshot of SVN state, tracking relevant changes in .changetag
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# easy, just do svn info, that contains all the information needed. If that fails, try other scms.
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svn info `dirname ${top_srcdir}` >> @$ || svn info `dirname ${top_srcdir}` >> $@ || echo "unknown" >> $@
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diff $@ .changetag > /dev/null 2>&1 || cp $@ .changetag