* installing *source* package ‘GMKMcharlie’ ...
** this is package ‘GMKMcharlie’ version ‘1.1.6’
** using staged installation
** libs
Makevars:3: *** missing separator.  Stop.
Warning in system(paste(MAKE, p1(paste("-f", shQuote(makefiles))), "compilers"),  :
  running command 'make -f 'Makevars' -f '/home/hornik/tmp/R/etc/Makeconf' -f '/home/hornik/tmp/R/share/make/shlib.mk' -f '/home/hornik/.R/Makevars-clang' compilers' had status 2
Calls: <Anonymous> ... do_install_source -> run_shlib -> .shlib_internal -> system
Error in if (nzchar(cxx)) { : argument is of length zero
* removing ‘/srv/hornik/tmp/CRAN_pretest/GMKMcharlie.Rcheck/GMKMcharlie’