libreadline conflict in r-base

Binary package hint: r-base

% sudo aptitude install r-cran-cluster
The following NEW packages will be installed:
  gfortran{a} gfortran-4.4{a} libblas-dev{a} liblapack-dev{a} libpcre3-dev{a} libpcrecpp0{a} libreadline-dev{a}
  libreadline6-dev{ab} r-base-core{a} r-base-dev{a} r-cran-boot{a} r-cran-class{a} r-cran-cluster
  r-cran-codetools{a} r-cran-foreign{a} r-cran-kernsmooth{a} r-cran-lattice{a} r-cran-mass{a} r-cran-matrix{a}
  r-cran-mgcv{a} r-cran-nlme{a} r-cran-nnet{a} r-cran-rpart{a} r-cran-spatial{a} r-cran-survival{a}
  r-doc-html{a} r-recommended{a}
0 packages upgraded, 27 newly installed, 0 to remove and 0 not upgraded.
Need to get 33.0MB of archives. After unpacking 69.7MB will be used.
The following packages have unmet dependencies:
  libreadline5-dev: Conflicts: libreadline-dev but 6.1-3 is to be installed.
  libreadline6-dev: Conflicts: libreadline5-dev but 5.2-7build1 is installed.

================

It seems that there is a conflict with the required packages libreadline-dev and libreadline6-dev