* installing *source* package ‘httpgd’ ...
** this is package ‘httpgd’ version ‘2.1.0’
** using staged installation
** libs
using C++ compiler: ‘Debian clang version 21.1.8 (3+b1)’
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R/include" -DNDEBUG -Ilib -DFMT_HEADER_ONLY -I'/srv/hornik/tmp/CRAN_pretest/Library/unigd/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/cpp11/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/AsioHeaders/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3   -fpic  -g -O3 -Wall -pedantic   -c cpp11.cpp -o cpp11.o
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R/include" -DNDEBUG -Ilib -DFMT_HEADER_ONLY -I'/srv/hornik/tmp/CRAN_pretest/Library/unigd/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/cpp11/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/AsioHeaders/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3   -fpic  -g -O3 -Wall -pedantic   -c httpgd.cpp -o httpgd.o
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R/include" -DNDEBUG -Ilib -DFMT_HEADER_ONLY -I'/srv/hornik/tmp/CRAN_pretest/Library/unigd/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/cpp11/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/AsioHeaders/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3   -fpic  -g -O3 -Wall -pedantic   -c httpgd_rng.cpp -o httpgd_rng.o
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R/include" -DNDEBUG -Ilib -DFMT_HEADER_ONLY -I'/srv/hornik/tmp/CRAN_pretest/Library/unigd/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/cpp11/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/AsioHeaders/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3   -fpic  -g -O3 -Wall -pedantic   -c httpgd_webserver.cpp -o httpgd_webserver.o
In file included from httpgd_webserver.cpp:2:
In file included from ./httpgd_webserver.h:9:
In file included from lib/crow.h:26:
lib/crow/app.h:211:9: error: constructor for 'crow::Crow<crow::CORSHandler, httpgd::web::WebServer::TokenGuard>' must explicitly initialize the member 'middlewares_' which does not have a default constructor
  211 |         Crow()
      |         ^
httpgd_webserver.cpp:160:23: note: in instantiation of member function 'crow::Crow<crow::CORSHandler, httpgd::web::WebServer::TokenGuard>::Crow' requested here
  160 |     : m_conf(t_conf), m_app(), m_mtx_update_subs(), m_update_subs()
      |                       ^
lib/crow/app.h:778:36: note: member is declared here
  778 |         std::tuple<Middlewares...> middlewares_;
      |                                    ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:833:11: note: 'std::tuple<crow::CORSHandler, httpgd::web::WebServer::TokenGuard>' declared here
  833 |     class tuple : public _Tuple_impl<0, _Elements...>
      |           ^
1 error generated.
make: *** [/home/hornik/tmp/R/etc/Makeconf:197: httpgd_webserver.o] Error 1
ERROR: compilation failed for package ‘httpgd’
* removing ‘/srv/hornik/tmp/CRAN_pretest/httpgd.Rcheck/httpgd’