could only build with change in /usr/include/graphviz/types.h

[cg-pasdzierny]

hello, I am pretty sure my fix is wrong but without changing

 line 49 #include <cgraph.h>

to line 49 #include <graphviz/cgraph.h>

my build stopped with "cgraph.h not found".

I am using red hat rhel 7 with gcc 11.2.1 and graphviz-devel 2.30.1

Thanks, Martin.