The no-dev option is deprecated.  Use -Wno-author instead.
CMake Warning (unused-cli):
  Manually-specified variables were not used by the project:

    CMAKE_LD_FLAGS
    ECM_MKSPECS_INSTALL_DIR


/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/util/signalcatcher.cpp: In static member function ‘static void bt::SignalCatcher::signalHandler(int, siginfo_t*, void*)’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/util/signalcatcher.cpp:99:12: warning: ignoring return value of ‘ssize_t write(int, const void*, size_t)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   99 |     ::write(signal_received_pipe[0], &sig, sizeof(int));
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/util/signalcatcher.cpp: In member function ‘void bt::SignalCatcher::handleInput(int)’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/util/signalcatcher.cpp:120:11: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  120 |     ::read(fd, &sig, sizeof(int));
      |     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp: In member function ‘virtual int net::Socket::send(const bt::Uint8*, int)’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp:273:27: warning: logical ‘and’ of equal expressions [-Wlogical-op]
  273 |         if (err != EAGAIN && err != EWOULDBLOCK) {
      |                           ^
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp: In member function ‘virtual int net::Socket::recv(bt::Uint8*, int)’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp:291:27: warning: logical ‘and’ of equal expressions [-Wlogical-op]
  291 |         if (err != EAGAIN && err != EWOULDBLOCK) {
      |                           ^
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp: In member function ‘int net::Socket::sendTo(const bt::Uint8*, int, const net::Address&)’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/net/socket.cpp:314:27: warning: logical ‘or’ of equal expressions [-Wlogical-op]
  314 |         if (err == EAGAIN || err == EWOULDBLOCK) {
      |                           ^
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/upnp/upnpmcastsocket.cpp: In member function ‘void bt::UPnPMCastSocket::onReadyRead()’:
/var/pisi/libktorrent-26.08.0-36/work/libktorrent-26.08.0/src/upnp/upnpmcastsocket.cpp:141:15: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  141 |         ::read(fd, &tmp, 1);
      |         ~~~~~~^~~~~~~~~~~~~