Hi, I posted this on the Boost User's group and did not have any response. I'll try again on the Boost Developers' group. On Win2K ( using cygwin g++ 3.3.1 ) using boost_1_32_0, read_graphviz has a syntax error when reading a digraph .dot file. The simplest way to reproduce this is to build a static libbgl-viz.lib and run the libs/graph/example/graphviz on the graphviz_test.dot input data. Note that the bjam reports that the testcase pass, but if you execute the graphviz.exe binary manually, you'll see the syntax error, like so: | > gcc/graphviz ../../../../../../../../../libs/graph/example/graphviz_test.dot | ... | syntax error | The same sources, when built with VC7.1 will pass with the correct output, when run manually. Like so : | > vc7/graphviz ../../../../../../../../../libs/graph/example/graphviz_test.dot | ... | a1 --> a2 b3 | a2 --> a3 | a3 --> end | a0 --> a1 a2 a3 | ... I can provide more information if needed. The basic question I have is whether this is a known problem for g++ 3.3.1 or a simple bug that someone more knowledgeable can take a look/fix. Thanks,