Missing source: compact_lang_det.h

[kt--]

Following the Linux build instructions on a fresh clone, the build stops citing an error:

~/Software/UltraStar-Creator/src
[komputa] qmake6 UltraStar-Creator.pro && make 
g++ -c -pipe -O2 -Wall -Wextra -fPIC -D_REENTRANT -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I. -I. -Imonty -Isong -Isupport -Iui -I../include/bass -I../include/bass_fx -I../include/cld2/public -I../include/srtparser -I/usr/include/taglib -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtWidgets -I/usr/include/x86_64-linux-gnu/qt6/QtGui -I/usr/include/x86_64-linux-gnu/qt6/QtNetwork -I/usr/include/x86_64-linux-gnu/qt6/QtCore -Itmp/release -Iui -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -o tmp/release/QUMainWindow.o QUMainWindow.cpp
QUMainWindow.cpp:31:10: fatal error: compact_lang_det.h: No such file or directory
   31 | #include "compact_lang_det.h"
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:893: tmp/release/QUMainWindow.o] Error 1

That file is not included in the archive, is there an undocumented step to generate it?

~/Software/UltraStar-Creator/src
[komputa] find . -iname compact_lang_det.h
<nothing found>

[DeinAlptraum]

This file is part of cld2, I assume you didn't pull the cld2 submodule in