[ruby-graphviz] Error: Could not find/open font : Times-Roman

after installing on Mac OS X 10.4.7 graphviz using dp and, afterwards,
Ruby-graphviz, i ran the test.

i get this error for all the tests :
Error: Could not find/open font : Times-Roman

unfortunately i don't have this font rather Times New Roman and Times.

then, is their a way to let ruby knows about installed fonts on Mac OS X
?

or nothing todo ?

···

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une bévue