Rcpp uses `Rf_list6()`, which was added around R 3.4

[DavisVaughan]

Rcpp 1.0.4 no longer builds from source on R 3.3 because of a call to Rf_list6() that was added here:

d65f3c0#diff-c524021f4c8787893aa50c251e4c35d7R35

That is because list6() was added to R in this commit here, around R 3.4

wch/r-source@7199ea1#diff-b2ce19943acaccf93558f770778c4730

Compilation on R 3.3 gives:

* installing *source* package ‘Rcpp’ ...
** package ‘Rcpp’ successfully unpacked and MD5 sums checked
** libs
g++ -I/opt/R/3.2.5/lib/R/include -DNDEBUG -I../inst/include/ -I/usr/local/include    -fpic  -g -O2  -c api.cpp -o api.o
In file included from ../inst/include/RcppCommon.h:135:0,
                 from ../inst/include/Rcpp.h:27,
                 from api.cpp:24:
../inst/include/Rcpp/lang.h: In function ‘SEXPREC* Rcpp::Rcpp_list7(SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP)’:
../inst/include/Rcpp/lang.h:45:55: error: ‘Rf_list6’ was not declared in this scope
     x0 = Rf_cons(x0, Rcpp_list6(x1, x2, x3, x4, x5, x6));
                                                       ^
../inst/include/Rcpp/lang.h: In function ‘SEXPREC* Rcpp::Rcpp_lang7(SEXP, SEXP, SEXP, SEXP, SEXP, SEXP, SEXP)’:
../inst/include/Rcpp/lang.h:53:56: error: ‘Rf_list6’ was not declared in this scope
     x0 = Rf_lcons(x0, Rcpp_list6(x1, x2, x3, x4, x5, x6));
                                                        ^
make: *** [api.o] Error 1
/opt/R/3.2.5/lib/R/etc/Makeconf:143: recipe for target 'api.o' failed
ERROR: compilation failed for package ‘Rcpp’

Rcpp could manually add list6() like purrr does
https://github.com/tidyverse/purrr/blob/aa7bc7f6d9854a1f2d5869536af652322a4bf38b/src/utils.c#L29-L34

[eddelbuettel]

That would be a bug if we promised support for R 3.3.0. I do not think we so.

Maybe you want to work on PR backfilling it? For reference it appears to have come from #1014.