TYPE_PREREQ
pre = TYPE_PREREQ;
if (pre != TYPE_PREREQ && installed && s->repo == installed)
addedge(od, reqq.elements[i], reqq.elements[j], pre == TYPE_PREREQ ? TYPE_PREREQ_P : TYPE_REQ_P);
addedge(od, p, p2, pre == TYPE_PREREQ ? TYPE_PREREQ_P : TYPE_REQ_P);
addedge(od, p2, p, pre == TYPE_PREREQ ? TYPE_PREREQ_P : TYPE_REQ_P);
if (ddegmin >= TYPE_REQ && (ddegmax & TYPE_PREREQ) != 0)