* installing *source* package ‘loon’ ...
** this is package ‘loon’ version ‘1.4.3’
** using staged installation
** R
** data
*** moving datasets to lazyload DB
** demo
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
Error: package or namespace load failed for ‘loon’:
 .onLoad failed in loadNamespace() for 'loon', details:
  call: structure(.External(.C_dotTcl, ...), class = "tclObj")
  error: [tcl] can't read "tcl_platform(os)": no such variable.

Error: loading failed
Execution halted
ERROR: loading failed
* removing ‘/srv/hornik/tmp/CRAN_pretest/loon.Rcheck/loon’