Linking errors with conda/mamba version

[akloeker]

I installed xeus-cling with xwidgets inside a JupyterLab like that:
mamba install -y -c conda-forge xeus-cling xwidgets

xeus-cling itself works well so far. However, running those two lines in a notebook results in the following error:

#include <xwidgets/xslider.hpp>
xw::slider<double> slider;

IncrementalExecutor::executeFunction: symbol '_ZNK2xw7xcommon10same_patchERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEERKN8nlohmann16json_abi_v3_11_310basic_jsonISt3mapSt6vectorS6_blmdSaNSA_14adl_serializerESD_IhSaIhEEvEERKSD_ISD_IcS5_ESaISK_EESJ_SO_' unresolved while linking function '_GLOBAL__sub_I_cling_module_6'!
You are probably missing the definition of xw::xcommon::same_patch(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void> const&, std::vector<std::vector<char, std::allocator<char> >, std::allocator<std::vector<char, std::allocator<char> > > > const&, nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void> const&, std::vector<std::vector<char, std::allocator<char> >, std::allocator<std::vector<char, std::allocator<char> > > > const&) const
Maybe you need to load the corresponding shared library?
IncrementalExecutor::executeFunction: symbol '_ZNK2xw7xcommon10send_patchEON8nlohmann16json_abi_v3_11_310basic_jsonISt3mapSt6vectorNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEblmdSaNS2_14adl_serializerES5_IhSaIhEEvEEOS5_IS5_IcSA_ESaISH_EEPKc' unresolved while linking function '_GLOBAL__sub_I_cling_module_6'!
You are probably missing the definition of xw::xcommon::send_patch(nlohmann::json_abi_v3_11_3::basic_json<std::map, std::vector, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long, unsigned long, double, std::allocator, nlohmann::json_abi_v3_11_3::adl_serializer, std::vector<unsigned char, std::allocator<unsigned char> >, void>&&, std::vector<std::vector<char, std::allocator<char> >, std::allocator<std::vector<char, std::allocator<char> > > >&&, char const*) const
Maybe you need to load the corresponding shared library?

I've noticed in the README that xwidget package is dependent on nlohmann_json<3.10. However, mamba installs nlohmann_json=3.11.3. Manually setting the json package to <3.10 also doesn't work as a lot of other xeus packages require a version >3.10 which results in unsolvable dependency conflicts.

What is the right workflow to make xwidgets work with xeus-cling?