[R-pkg-team] Bug#1134484: r-cran-s2: FTBFS: error: ‘R_NamespaceRegistry’ was not declared in this scope

[Sebastian Ramacher]

Source: r-cran-s2
Version: 1.1.9-2
Severity: serious
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)
X-Debbugs-Cc: sramacher at debian.org

Dear maintainer,

r-cran-s2 FTBFS:

make[1]: Entering directory '/build/reproducible-path/r-cran-s2-1.1.9/src'
x86_64-linux-gnu-g++ -std=gnu++17 -I"/usr/share/R/include" -DNDEBUG -I../src -DSTRICT_R_HEADERS -I'/usr/lib/R/site-library/Rcpp/include' -I'/usr/lib/R/site-library/wk/include'    -pthread -fpic  -g -O2 -ffile-prefix-map=/build/reproducible-path/r-base-4.5.3.20260417=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -c cpp-compat.cpp -o cpp-compat.o
In file included from /usr/lib/R/site-library/Rcpp/include/Rcpp.h:49,
                 from cpp-compat.cpp:3:
/usr/lib/R/site-library/Rcpp/include/Rcpp/Function.h: In constructor ‘Rcpp::Function_Impl<StoragePolicy>::Function_Impl(const std::string&, const std::string&)’:
/usr/lib/R/site-library/Rcpp/include/Rcpp/Function.h:75:65: error: ‘R_NamespaceRegistry’ was not declared in this scope [-Wtemplate-body]
   75 |             Shield<SEXP> env(R_getVarEx(Rf_install(ns.c_str()), R_NamespaceRegistry, FALSE, R_UnboundValue));
      |                                                                 ^~~~~~~~~~~~~~~~~~~
make[1]: *** [/usr/lib/R/etc/Makeconf:199: cpp-compat.o] Error 1
make[1]: Leaving directory '/build/reproducible-path/r-cran-s2-1.1.9/src'
make[1]: Entering directory '/build/reproducible-path/r-cran-s2-1.1.9/src'
make[1]: Leaving directory '/build/reproducible-path/r-cran-s2-1.1.9/src'
ERROR: compilation failed for package ‘s2’
* removing ‘/build/reproducible-path/r-cran-s2-1.1.9/debian/r-cran-s2/usr/lib/R/site-library/s2’
dh_auto_install: error: R CMD INSTALL -l /build/reproducible-path/r-cran-s2-1.1.9/debian/r-cran-s2/usr/lib/R/site-library --clean . --built-timestamp="'Mon, 20 Apr 2026 11:43:28 +0000'" returned exit code 1
make: *** [debian/rules:4: binary-arch] Error 25

See
https://buildd.debian.org/status/fetch.php?pkg=r-cran-s2&arch=amd64&ver=1.1.9-2%2Bb1&stamp=1776685463&raw=0
for more details.

Cheers
-- 
Sebastian Ramacher