[R-pkg-team] Bug#1012219: Please adjust StanHeaders to new version of (one)tbb

[Benjamin K Goodrich]

Sorry for the late reply. I am told that StanHeaders can be built
successfully with oneTBB by setting environmental variables like
TBB_INC and TBB_LIB. On CRAN, we would like to use the version of TBB
that comes with the RcppParallel package

https://github.com/RcppCore/RcppParallel/pull/144

Although with the next release of StanHeaders we will not be able to
achieve that because not all packages are LinkingTo RcppParallel so we
have to build a similar TBB in the StanHeaders shared object. But on
Debian, if r-cran-rcppparallel switches to oneTBB, then it would be
fine if r-cran-stanheaders, r-cran-rstan, etc. depends on
r-cran-rcppparallel.