RcppParallel 4.4.2
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* Suppress gcc-8 warnings related to -Wclass-memaccess
* Use PKG_CXXFLAGS rather than PKG_CPPFLAGS
* Remove unused dependency on the BH package

RcppParallel 4.4.1
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* Ensure user-specified R configuration passed to TBB
* Work around warnings emitted by gcc 8

RcppParallel 4.4.0
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* Respect user-defined compiler settings (e.g. from ~/.R/Makevars).
* Remove TBB's attempts to suppress compiler diagnostics.
* Allow setting the number of threads to use via RCPP_PARALLEL_NUM_THREADS
  environment variable.
* Update to TBB 2018 Update 1.
* Add native registration of compiled functions.

RcppParallel 4.3.20
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* Add support for Rtools 3.3 w/ GCC 4.9

RcppParallel 4.3.14
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* Add support for TBB on Solaris
* Fix failure to compile on OS X Snow Leopard R toolchain
* Add const and non-const operator[] for RMatrix class

RcppParallel 4.3.8
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* Add tbbmalloc library
* Correctly pass clang to TBB configure when R is using clang

RcppParallel 4.3.6
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* Support for TBB on Windows

RcppParallel 4.3.3
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* Update to TBB 4.3 (fixes clang compilation error in platform.h)
* Forward CXX to TBB Makefile

RcppParallel 4.2.5
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* Initial release
