Bug#1052740: graphite2: FTBFS: graph_legend.dot:1: error: Problems running dot: exit code=1, command='dot', arguments='"/<>/build/doc/doxygen/html/graph_legend.dot" -Tpng -o "/<>/build/doc/doxygen/html/graph_legend.png"'

[Bastian Germann]

graph_legend.dot should have quotes around the font name references.
This is probably a doxygen bug. A workaround would be removing doxygen from 
Build-Depends
and the two doxgen output files from debian/libgraphite2-doc.docs