* installing *source* package 'pmtc' ...
** using staged installation
** R
** data
*** moving datasets to lazyload DB
** byte-compile and prepare package for lazy loading
Installing packages into 'D:/temp/RtmpKoZwZI/RLIBS_230d442983467'
(as 'lib' is unspecified)
Error in contrib.url(repos, "source") : 
  trying to use CRAN without setting a mirror
Error: unable to load R code in package 'pmtc'
Execution halted
ERROR: lazy loading failed for package 'pmtc'
* removing 'd:/RCompile/CRANincoming/R-devel/lib/pmtc'