Problem with utils.cpp.o

[Wise71]

I trying compile the project and getting errors:

[ 98%] Building CXX object CMakeFiles/tg2sip.dir/tg2sip/utils.cpp.o /usr/src/tg2sip/tg2sip/utils.cpp:21:64: error: implicit instantiation of undefined template 'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >' bool is_digits(const std::string &str) { return std::all_of(str.begin(), str.end(), ::isdigit); }; ^ /usr/lib/llvm-10/bin/../include/c++/v1/iosfwd:209:32: note: template is declared here class _LIBCPP_TEMPLATE_VIS basic_string; ^ /usr/src/tg2sip/tg2sip/utils.cpp:21:77: error: implicit instantiation of undefined template 'std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >' bool is_digits(const std::string &str) { return std::all_of(str.begin(), str.end(), ::isdigit); }; ^ /usr/lib/llvm-10/bin/../include/c++/v1/iosfwd:209:32: note: template is declared here class _LIBCPP_TEMPLATE_VIS basic_string; ^ /usr/src/tg2sip/tg2sip/utils.cpp:21:87: error: no member named 'isdigit' in the global namespace; did you mean 'is_digits'? bool is_digits(const std::string &str) { return std::all_of(str.begin(), str.end(), ::isdigit); }; ~~^~~~~~~ is_digits /usr/src/tg2sip/tg2sip/utils.cpp:21:6: note: 'is_digits' declared here bool is_digits(const std::string &str) { return std::all_of(str.begin(), str.end(), ::isdigit); }; ^ 3 errors generated. make[2]: *** [CMakeFiles/tg2sip.dir/build.make:128: CMakeFiles/tg2sip.dir/tg2sip/utils.cpp.o] Error 1 make[1]: *** [CMakeFiles/Makefile2:125: CMakeFiles/tg2sip.dir/all] Error 2 make: *** [Makefile:84: all] Error 2

[Infactum]

Please check you build environment: std::isdigit should be implemented by standard library.
See https://github.com/Infactum/tg2sip/tree/master/buildenv for details.