Error(s) in re-building vignettes:
  ...
--- re-building ‘CheckingSynth.Rmd’ using rmarkdown
--- finished re-building ‘CheckingSynth.Rmd’

--- re-building ‘UsingTimeSeries.Rmd’ using rmarkdown
trying URL 'https://cran.r-project.org/src/contrib/Archive/Synth/Synth_1.1-6.tar.gz'
Content type 'application/x-gzip' length 75997 bytes (74 KB)
==================================================
downloaded 74 KB

Warning in in_dir(input_dir(), expr) :
  You changed the working directory to /tmp/Rtmpby9Xtu (probably via setwd()). It will be restored to /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/MSCMT.Rcheck/vign_test/MSCMT/vignettes. See the Note section in ?knitr::knit
--- finished re-building ‘UsingTimeSeries.Rmd’

+-+UsingTimeSeries.html
Assertion failure at kmp_runtime.cpp(6918): temp_reg_status_file_name.
OMP: Error #13: Assertion failure at kmp_runtime.cpp(6918).
OMP: Hint Please submit a bug report with this message, compile and run commands used, and machine configuration info including native compiler and operating system versions. Faster response will be obtained by including all program sources. For information on submitting this issue, please see https://bugs.llvm.org/.
Assertion failure at kmp_runtime.cpp(6918): temp_reg_status_file_name.
OMP: Error #13: Assertion failure at kmp_runtime.cpp(6918).
OMP: Hint Please submit a bug report with this message, compile and run commands used, and machine configuration info including native compiler and operating system versions. Faster response will be obtained by including all program sources. For information on submitting this issue, please see https://bugs.llvm.org/.
Killed
--- re-building ‘WorkingWithMSCMT.Rmd’ using rmarkdown
trying URL 'https://cran.r-project.org/src/contrib/Archive/Synth/Synth_1.1-6.tar.gz'
Content type 'application/x-gzip' length 75997 bytes (74 KB)
==================================================
downloaded 74 KB

Warning in in_dir(input_dir(), expr) :
  You changed the working directory to /tmp/RtmpJwuAhs (probably via setwd()). It will be restored to /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/MSCMT.Rcheck/vign_test/MSCMT/vignettes. See the Note section in ?knitr::knit
--- finished re-building ‘WorkingWithMSCMT.Rmd’

SUMMARY: processing the following file failed:
  ‘UsingTimeSeries.Rmd’

Error: Vignette re-building failed.
Execution halted