Linker error on linux

[rezso]

I tried to compile 748b5cb with gcc 13 and qt 6.5.1, but fails:
/bin/ld: lib/libQHotKey.a(QHotkey.cpp.o): in function QHotkeyPrivate::~QHotkeyPrivate()': QHotkey.cpp:(.text+0xfc2): undefined reference to vtable for QHotkeyPrivate'
/bin/ld: lib/libQHotKey.a(QHotkey.cpp.o): in function QHotkeyPrivate::QHotkeyPrivate()': QHotkey.cpp:(.text+0x129d): undefined reference to vtable for QHotkeyPrivate'
/bin/ld: lib/libQHotKey.a(qhotkey_x11.cpp.o):(.data.rel.ro._ZTI17QHotkeyPrivateX11[_ZTI17QHotkeyPrivateX11]+0x10): undefined reference to typeinfo for QHotkeyPrivate' /bin/ld: lib/libQHotKey.a(qhotkey_x11.cpp.o):(.data.rel.ro._ZTV17QHotkeyPrivateX11[_ZTV17QHotkeyPrivateX11]+0x10): undefined reference to QHotkeyPrivate::metaObject() const'
/bin/ld: lib/libQHotKey.a(qhotkey_x11.cpp.o):(.data.rel.ro._ZTV17QHotkeyPrivateX11[_ZTV17QHotkeyPrivateX11]+0x18): undefined reference to QHotkeyPrivate::qt_metacast(char const*)' /bin/ld: lib/libQHotKey.a(qhotkey_x11.cpp.o):(.data.rel.ro._ZTV17QHotkeyPrivateX11[_ZTV17QHotkeyPrivateX11]+0x20): undefined reference to QHotkeyPrivate::qt_metacall(QMetaObject::Call, int, void**)'
collect2: error: ld returned 1 exit status