+ #ifdef APPLE
+ std::string command1 ("dot -Tpng:quartz -o " + filename_png2 + " " + filename_dot2 );
+ std::string command1a("dot -T cmap -o " + filename_cmap2 + " " + filename_dot2 );
+ #else
+ std::string command1 ("dot -Tpng:cairo -o " + filename_png2 + " " + filename_dot2 );
+ std::string command1a("dot -T cmap -o " + filename_cmap2 + " " + filename_dot2 );
+ #endif