Actually, this is the error without the patch:
foreign-graphml.c: In function 'igraph_write_graph_graphml':
foreign-graphml.c:1408:46: error: expected ')' before 'GRAPHML_NAMESPACE_URI'
ret=fprintf(outstream, "<graphml xmlns=\"" GRAPHML_NAMESPACE_URI "\"\n");
^~~~~~~~~~~~~~~~~~~~~
foreign-graphml.c:1412:59: error: expected ')' before 'GRAPHML_NAMESPACE_URI'
ret=fprintf(outstream, " xsi:schemaLocation=\""
GRAPHML_NAMESPACE_URI "\n");
^~~~~~~~~~~~~~~~~~~~~
foreign-graphml.c:1414:38: error: expected ')' before 'GRAPHML_NAMESPACE_URI'
ret=fprintf(outstream, " " GRAPHML_NAMESPACE_URI
"/1.0/graphml.xsd\">\n");
^~~~~~~~~~~~~~~~~~~~~-- WBR, wRAR
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