[R] make check Error: could not get timezone

[Stephen Berman]

I just built the latest R-patched from source (SVN-Revision: 73548, Last
Changed Date: 2017-10-12) and the build completed without a problem but
`make check' errored out:

  running code in 'reg-tests-1d.R' ...make[3]: *** [Makefile.common:100: reg-tests-1d.Rout] Error 1
  make[3]: Leaving directory '/sources/R-patched/tests'
  make[2]: *** [Makefile.common:275: test-Reg] Error 2
  make[2]: Leaving directory '/sources/R-patched/tests'
  make[1]: *** [Makefile.common:165: test-all-basics] Error 1
  make[1]: Leaving directory '/sources/R-patched/tests'
  make: *** [Makefile:239: check] Error 2

The test log reg-tests-1d.Rout.fail ends like this:

  > ## PR#17186 - Sys.timezone() on some Debian-derived platforms
  > (S.t <- Sys.timezone())
  [1] NA
  > if(is.na(S.t) || !nzchar(S.t)) stop("could not get timezone")
  Error: could not get timezone
  Execution halted

Is this a cause for concern and if so, what should I do?  My system is
Linux From Scratch 8.1 (x86_64, linux 4.12.7, glibc 2.26, gcc 7.2.0).

Thanks,
Steve Berman