* installing *source* package ‘httpgd’ ...
** this is package ‘httpgd’ version ‘2.1.2’
** 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:212:11: error: no matching constructor for initialization of 'std::tuple<crow::CORSHandler, httpgd::web::WebServer::TokenGuard>'
  212 |           middlewares_()
      |           ^
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()
      |                       ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:983:2: note: candidate template ignored: constraints not satisfied [with _UTypes = <>]
  983 |         tuple(_UTypes&&... __u)
      |         ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:979:12: note: because '__disambiguating_constraint<>()' evaluated to false
  979 |         requires (__disambiguating_constraint<_UTypes...>())
      |                   ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:992:2: note: candidate template ignored: constraints not satisfied [with _UTypes = <>]
  992 |         tuple(_UTypes&&...) = delete;
      |         ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:989:12: note: because '__disambiguating_constraint<>()' evaluated to false
  989 |         requires (__disambiguating_constraint<_UTypes...>())
      |                   ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:963:7: note: candidate constructor not viable: constraints not satisfied
  963 |       tuple()
      |       ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:965:17: note: because 'is_default_constructible_v<httpgd::web::WebServer::TokenGuard>' evaluated to false
  965 |       requires (is_default_constructible_v<_Elements> && ...)
      |                 ^
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:994:17: note: candidate constructor not viable: requires 1 argument, but 0 were provided
  994 |       constexpr tuple(const tuple&) = default;
      |                 ^     ~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:996:17: note: candidate constructor not viable: requires 1 argument, but 0 were provided
  996 |       constexpr tuple(tuple&&) = default;
      |                 ^     ~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1003:2: note: candidate constructor template not viable: requires single argument '__u', but no arguments were provided
 1003 |         tuple(const tuple<_UTypes...>& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1019:2: note: candidate constructor template not viable: requires single argument '__u', but no arguments were provided
 1019 |         tuple(tuple<_UTypes...>&& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1069:2: note: candidate constructor template not viable: requires single argument '__u', but no arguments were provided
 1069 |         tuple(const pair<_U1, _U2>& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1085:2: note: candidate constructor template not viable: requires single argument '__u', but no arguments were provided
 1085 |         tuple(pair<_U1, _U2>&& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1012:2: note: candidate constructor template not viable: requires 1 argument, but 0 were provided
 1012 |         tuple(const tuple<_UTypes...>&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1028:2: note: candidate constructor template not viable: requires 1 argument, but 0 were provided
 1028 |         tuple(tuple<_UTypes...>&&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1078:2: note: candidate constructor template not viable: requires 1 argument, but 0 were provided
 1078 |         tuple(const pair<_U1, _U2>&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1095:2: note: candidate constructor template not viable: requires 1 argument, but 0 were provided
 1095 |         tuple(pair<_U1, _U2>&&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:972:2: note: candidate constructor template not viable: requires 2 arguments, but 0 were provided
  972 |         tuple(const _Elements&... __elements)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1156:2: note: candidate constructor template not viable: requires 2 arguments, but 0 were provided
 1156 |         tuple(allocator_arg_t __tag, const _Alloc& __a)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1174:2: note: candidate constructor template not viable: requires at least 2 arguments, but 0 were provided
 1174 |         tuple(allocator_arg_t __tag, const _Alloc& __a, _UTypes&&... __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1202:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1202 |         tuple(allocator_arg_t __tag, const _Alloc& __a,
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1203 |               const tuple<_UTypes...>& __u)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1219:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1219 |         tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_UTypes...>&& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1268:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1268 |         tuple(allocator_arg_t __tag, const _Alloc& __a,
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1269 |               const pair<_U1, _U2>& __u)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1285:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1285 |         tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1182:2: note: candidate constructor template not viable: requires at least 2 arguments, but 0 were provided
 1182 |         tuple(allocator_arg_t, const _Alloc&, _UTypes&&...) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1186:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1186 |         tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1193:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1193 |         tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __u)
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1212:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1212 |         tuple(allocator_arg_t, const _Alloc&, const tuple<_UTypes...>&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1227:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1227 |         tuple(allocator_arg_t, const _Alloc&, tuple<_UTypes...>&&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1278:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1278 |         tuple(allocator_arg_t, const _Alloc&, const pair<_U1, _U2>&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1294:2: note: candidate constructor template not viable: requires 3 arguments, but 0 were provided
 1294 |         tuple(allocator_arg_t, const _Alloc&, pair<_U1, _U2>&&) = delete;
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/tuple:1163:2: note: candidate constructor template not viable: requires 4 arguments, but 0 were provided
 1163 |         tuple(allocator_arg_t __tag, const _Alloc& __a,
      |         ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1164 |               const _Elements&... __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’