Hello. This commit[1] ports std::mem_fun (deprecated in C++17) to std::mem_fn, which fixes the build with clang since libc++ seems to have removed std::mem_fun. [1] https://invent.kde.org/frameworks/kio/-/commit/36f1814b184f4d5ac628fca5db5f6cc1440b4db7 https://bugs.kde.org/show_bug.cgi?id=439780 Have a good day. -- Ahmad Samir