This macro is clearly typoed (it refers to the field `cl_nt` while its name says
`cl_cnt`), but this macro has also never been used.
#define GD_dist(g) (((Agraphinfo_t*)AGDATA(g))->dist)
#define GD_alg(g) (((Agraphinfo_t*)AGDATA(g))->alg)
#define GD_border(g) (((Agraphinfo_t*)AGDATA(g))->border)
-#define GD_cl_cnt(g) (((Agraphinfo_t*)AGDATA(g))->cl_nt)
#define GD_clust(g) (((Agraphinfo_t*)AGDATA(g))->clust)
#define GD_dotroot(g) (((Agraphinfo_t*)AGDATA(g))->dotroot)
#define GD_comp(g) (((Agraphinfo_t*)AGDATA(g))->comp)