View Compilation Error

0_0_38801886_6739.cpp: In member function 'frac frac::operator+(frac) const':
0_0_38801886_6739.cpp:37:40: error: '__lcm' is not a member of 'std::__detail'
   37 |                 LL tf = std::__detail::__lcm(fm, f.fm);
      |                                        ^~~~~
0_0_38801886_6739.cpp: In member function 'frac frac::operator-(frac) const':
0_0_38801886_6739.cpp:44:40: error: '__lcm' is not a member of 'std::__detail'
   44 |                 LL tf = std::__detail::__lcm(fm, f.fm);
      |                                        ^~~~~
0_0_38801886_6739.cpp: In member function 'bool frac::operator<(frac) const':
0_0_38801886_6739.cpp:51:40: error: '__lcm' is not a member of 'std::__detail'
   51 |                 LL tf = std::__detail::__lcm(fm, f.fm);
      |                                        ^~~~~