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### Running command:
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###   /Library/Frameworks/R.framework/Versions/Current/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data CountClust
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* checking for file ‘CountClust/DESCRIPTION’ ... OK
* preparing ‘CountClust’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘count-clust.Rmd’ using rmarkdown
Loading required package: usethis
Downloading GitHub repo TaddyLab/maptpx@HEAD
Installing package into '/private/tmp/RtmpVHGUun/Rinst5152370a812'
(as 'lib' is unspecified)
* installing *source* package ‘maptpx’ ...
** using staged installation
** libs
clang -mmacosx-version-min=10.13 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/usr/local/include  -DRPRINT  -fPIC  -Wall -g -O2  -c init.c -o init.o
clang -mmacosx-version-min=10.13 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/usr/local/include  -DRPRINT  -fPIC  -Wall -g -O2  -c latools.c -o latools.o
clang -mmacosx-version-min=10.13 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/usr/local/include  -DRPRINT  -fPIC  -Wall -g -O2  -c rhelp.c -o rhelp.o
clang -mmacosx-version-min=10.13 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG   -I/usr/local/include  -DRPRINT  -fPIC  -Wall -g -O2  -c topics.c -o topics.o
clang -mmacosx-version-min=10.13 -dynamiclib -Wl,-headerpad_max_install_names -undefined dynamic_lookup -single_module -multiply_defined suppress -L/Library/Frameworks/R.framework/Resources/lib -L/usr/local/lib -o maptpx.so init.o latools.o rhelp.o topics.o -L/Library/Frameworks/R.framework/Resources/lib -lRlapack -L/Library/Frameworks/R.framework/Resources/lib -lRblas -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin18/8.2.0 -L/usr/local/gfortran/lib -lgfortran -lquadmath -lm -F/Library/Frameworks/R.framework/.. -framework R -Wl,-framework -Wl,CoreFoundation
installing to /private/tmp/RtmpVHGUun/Rinst5152370a812/00LOCK-maptpx/00new/maptpx/libs
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
** checking absolute paths in shared objects and dynamic libraries
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (maptpx)
Loading required package: ggplot2
Warning in download.file("https://cdn.rawgit.com/kkdey/singleCellRNASeqMouseDeng2014/master/data/Deng2014MouseEsc.rda",  :
  URL 'https://cdn.rawgit.com/kkdey/singleCellRNASeqMouseDeng2014/master/data/Deng2014MouseEsc.rda': status was 'Peer certificate cannot be authenticated with given CA certificates'
Quitting from lines 99-113 (count-clust.Rmd) 
Error: processing vignette 'count-clust.Rmd' failed with diagnostics:
cannot open URL 'https://cdn.rawgit.com/kkdey/singleCellRNASeqMouseDeng2014/master/data/Deng2014MouseEsc.rda'
--- failed re-building ‘count-clust.Rmd’

SUMMARY: processing the following file failed:
  ‘count-clust.Rmd’

Error: Vignette re-building failed.
Execution halted