https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78872
--- Comment #1 from Jim Michaels <jmichae3 at yahoo dot com> --- icompare.cpp:12:119: error: no 'int std::locale::icompare(const char_type*, const char_type*, const char_type*, const char_type*) const' member function declared in class 'std::locale' int locale::icompare(const char_type* low1, const char_type* high1, const char_type*low2, const char_type* high2) const; ^~~~~