Unable to build on Gentoo Linux

[Fl0wdnb]

Full log:

prompt$ cmake . && make

CMake Deprecation Warning at CMakeLists.txt:2 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- Configuring done
-- Generating done
-- Build files have been written to: /tmp/grub-customizer
[ 12%] Building CXX object CMakeFiles/grub-customizer.dir/src/main/client.cpp.o
In file included from /tmp/grub-customizer/src/main/../Bootstrap/../Model/Proxy.hpp:29,
from /tmp/grub-customizer/src/main/../Bootstrap/../Model/Proxylist.hpp:27,
from /tmp/grub-customizer/src/main/../Bootstrap/../Model/ListCfg.hpp:46,
from /tmp/grub-customizer/src/main/../Bootstrap/Factory.hpp:24,
from /tmp/grub-customizer/src/main/client.cpp:23:
/tmp/grub-customizer/src/main/../Bootstrap/../Model/ProxyScriptData.hpp: In member function ‘bool Model_ProxyScriptData::load(FILE*)’:
/tmp/grub-customizer/src/main/../Bootstrap/../Model/ProxyScriptData.hpp:119:9: warning: no return statement in function returning non-void [-Wreturn-type]
119 | }
| ^
/tmp/grub-customizer/src/main/../Bootstrap/../Model/ListCfg.hpp: In member function ‘bool Model_ListCfg::compare(const Model_ListCfg&) const’:
/tmp/grub-customizer/src/main/../Bootstrap/../Model/ListCfg.hpp:864:71: error: aggregate ‘std::array<std::__cxx11::list<std::shared_ptr<Model_Rule> >, 2> rlist’ has incomplete type and cannot be defined
864 | std::array<std::list<std::shared_ptr<Model_Rule>>, 2> rlist;
| ^~~~~

make[2]: *** [CMakeFiles/grub-customizer.dir/build.make:76: CMakeFiles/grub-customizer.dir/src/main/client.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:86: CMakeFiles/grub-customizer.dir/all] Error 2
make: *** [Makefile:136: all] Error 2