closure.kstructure: no visible global function definition for
  ‘binary_closure’
closure.kstructure: no visible global function definition for ‘as.set’
closure.kstructure : <anonymous>: no visible global function definition
  for ‘as.set’
kassess: no visible global function definition for ‘as.set’
katoms: no visible global function definition for ‘as.set’
katoms: no visible global function definition for ‘set’
katoms: no visible binding for global variable ‘set_is_subset’
kbase: no visible global function definition for ‘as.set’
kdomain: no visible global function definition for ‘as.set’
kfringe: no visible global function definition for
  ‘set_contains_element’
kfringe_inner: no visible global function definition for ‘set_outer’
kfringe_inner: no visible binding for global variable
  ‘set_is_proper_subset’
kfringe_inner: no visible global function definition for ‘relation’
kfringe_inner: no visible global function definition for
  ‘relation_domain’
kfringe_inner: no visible global function definition for
  ‘relation_incidence’
kfringe_inner: no visible global function definition for
  ‘transitive_reduction’
kfringe_inner: no visible global function definition for ‘set’
kfringe_inner: no visible global function definition for ‘set_symdiff’
kfringe_inner: no visible global function definition for ‘LABEL’
kfringe_outer: no visible global function definition for ‘set_outer’
kfringe_outer: no visible binding for global variable
  ‘set_is_proper_subset’
kfringe_outer: no visible global function definition for ‘relation’
kfringe_outer: no visible global function definition for
  ‘relation_domain’
kfringe_outer: no visible global function definition for
  ‘relation_incidence’
kfringe_outer: no visible global function definition for
  ‘transitive_reduction’
kfringe_outer: no visible global function definition for ‘set’
kfringe_outer: no visible global function definition for ‘set_symdiff’
kfringe_outer: no visible global function definition for ‘LABEL’
knotions: no visible global function definition for ‘set’
knotions: no visible global function definition for ‘as.set’
kspace: no visible global function definition for ‘set’
kstructure: no visible global function definition for
  ‘relation_incidence’
kstructure: no visible global function definition for ‘as.set’
kstructure : <anonymous>: no visible global function definition for
  ‘as.set’
kstructure: no visible binding for global variable ‘as.set’
kstructure_is_wellgraded: no visible global function definition for
  ‘tuple’
ktrace: no visible global function definition for ‘as.set’
ktrace: no visible binding for global variable ‘set_intersection’
kvalidate: no visible global function definition for ‘as.set’
kvalidate: no visible global function definition for
  ‘relation_incidence’
kvalidate: no visible global function definition for ‘set’
lpath: no visible global function definition for ‘set_outer’
lpath: no visible binding for global variable ‘set_is_proper_subset’
lpath: no visible global function definition for ‘relation’
lpath: no visible global function definition for ‘relation_domain’
lpath: no visible global function definition for ‘relation_incidence’
lpath: no visible global function definition for ‘transitive_reduction’
lpath : FUN: no visible global function definition for ‘as.tuple’
plot.kstructure: no visible global function definition for ‘set_outer’
plot.kstructure: no visible binding for global variable ‘set_is_subset’
plot.kstructure: no visible global function definition for ‘plot’
plot.kstructure: no visible global function definition for ‘relation’
reduction.kstructure: no visible global function definition for ‘set’
reduction.kstructure: no visible global function definition for
  ‘set_is_subset’
reduction.kstructure: no visible global function definition for
  ‘set_union’
reduction.kstructure: no visible global function definition for
  ‘set_symdiff’
reduction.kstructure: no visible global function definition for
  ‘as.set’
Undefined global functions or variables:
  LABEL as.set as.tuple binary_closure plot relation relation_domain
  relation_incidence set set_contains_element set_intersection
  set_is_proper_subset set_is_subset set_outer set_symdiff set_union
  transitive_reduction tuple
Consider adding
  importFrom("graphics", "plot")
to your NAMESPACE file.