../sources/ui/alignmenttextdialog.cpp

#include "alignmenttextdialog.h"

#include "../qetgraphicsitem/dynamicelementtextitem.h"
#include "ui_alignmenttextdialog.h"

../sources/ui/dynamicelementtextitemeditor.cpp

#include "dynamicelementtextitemeditor.h"

#include "../QPropertyUndoCommand/qpropertyundocommand.h"
#include "../diagram.h"
#include "../elementtextpattern.h"
#include "../qetgraphicsitem/dynamicelementtextitem.h"
#include "../qetgraphicsitem/element.h"
#include "../qetgraphicsitem/elementtextitemgroup.h"
#include "../ui_dynamicelementtextitemeditor.h"
#include "../undocommand/addelementtextcommand.h"
#include "../undocommand/deleteqgraphicsitemcommand.h"
#include "dynamicelementtextmodel.h"

#include <QTreeView>
#include <QUndoCommand>

Vous devez supprimer ../ avant ui_

If you don't believe me, take a look here.
../sources/ui/alignmenttextdialog.cpp
You'll see that I'm right.

You need to remove ../ before ui_

CONFIG += qt c++17 debug warn_on link_pkgconfig
QMAKE_CXXFLAGS += -std=c++17 -Wall

EN
https://gcc.gnu.org/onlinedocs/gcc/
https://gcc.gnu.org/onlinedocs/gcc/Option-Summary.html
https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

Compiled Qt6-branch of QET with the latest Debian unstable and Qt6.

You seem to be doing something different from everyone else:
You are the first and so far the only one to report these effects...

Use qmake6 in console

g++ -c -pipe -std=c++17 -Wall -g -std=gnu++1z -Wall -Wextra -D_REENTRANT -DQET_ALLOW_OVERRIDE_CED_OPTION -DQET_ALLOW_OVERRIDE_CTBTD_OPTION -DQET_ALLOW_OVERRIDE_CD_OPTION -DQET_ALLOW_OVERRIDE_DD_OPTION -DQET_EXPORT_PROJECT_DB -DQAPPLICATION_CLASS=QApplication -DQT_MESSAGELOGCONTEXT -DGIT_COMMIT_SHA=\"411fb3c4dc54b6aaea00f034d6c5396de5daa474\" -DQET_LANG_PATH=/home/me/1QET093ec56/build/share/qelectrotech/lang/ -DQET_COMMON_COLLECTION_PATH=/home/me/1QET093ec56/build/share/qelectrotech/elements/ -DQET_COMMON_TBT_PATH=/home/me/1QET093ec56/build/share/qelectrotech/titleblocks/ -DQT_SVG_LIB -DQT_PRINTSUPPORT_LIB -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_XML_LIB -DQT_SQL_LIB -DQT_CONCURRENT_LIB -DQT_CORE_LIB -I../../1QET093ec56 -I. -I../SingleApplication -I../sources/ui -I../sources/TerminalStrip/ui -I/usr/include/x86_64-linux-gnu/qt6 -I/usr/include/x86_64-linux-gnu/qt6/QtSvg -I/usr/include/x86_64-linux-gnu/qt6/QtPrintSupport -I/usr/include/KF6/KWidgetsAddons -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/QtXml -I/usr/include/x86_64-linux-gnu/qt6/QtSql -I/usr/include/x86_64-linux-gnu/qt6/QtConcurrent -I/usr/include/KF6/KCoreAddons -I/usr/include/x86_64-linux-gnu/qt6/QtCore -I. -I. -I/usr/lib/x86_64-linux-gnu/qt6/mkspecs/linux-g++ -o dynamicelementtextitemeditor.o ../sources/ui/dynamicelementtextitemeditor.cpp
../sources/ui/dynamicelementtextitemeditor.cpp:26:10: fatal error: ../ui_dynamicelementtextitemeditor.h: No such file or directory
   26 | #include "../ui_dynamicelementtextitemeditor.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:6893: dynamicelementtextitemeditor.o] Error 1
make: *** Waiting for unfinished jobs....

../sources/colorbutton.cpp: In member function ‘void ColorButton::clicked(bool)’:
../sources/colorbutton.cpp:56:32: warning: unused parameter ‘checked’ [-Wunused-parameter]
   56 | void ColorButton::clicked(bool checked)
      |                           ~~~~~^~~~~~~

../sources/colorcombobox.cpp: In member function ‘virtual void ColorComboBox::paintEvent(QPaintEvent*)’:
../sources/colorcombobox.cpp:80:45: warning: unused parameter ‘e’ [-Wunused-parameter]
   80 | void ColorComboBox::paintEvent(QPaintEvent *e) {
      |                                ~~~~~~~~~~~~~^

../sources/editor/UndoCommand/openelmtcommand.cpp: In member function ‘virtual void OpenElmtCommand::redo()’:
../sources/editor/UndoCommand/openelmtcommand.cpp:66:102: note: ‘#pragma message: @TODO uncommante slot_select when fixed, see itemChange function for each primitive’
   66 | #pragma message("@TODO uncommante slot_select when fixed, see itemChange function for each primitive")
      |                                                                                                      ^

What is your build-environment?
What versions do you use? (OS, Qt, Compiler, etc)
How do you compile?
What error-messages do you get, when not changing these lines?

Edit:
You have not yet given any reason why these lines should be changed.

QET_changes-files

../ui_ TO ui

../sources/ui/

dynamicelementtextitemeditor.cpp   
line 26 MUST BE #include "ui_dynamicelementtextitemeditor.h"
elementinfowidget.cpp
Line 24 MUST BE #include "ui_elementinfowidget.h"
imagepropertieswidget.cpp
Line 23 MUST BE #include "ui_imagepropertieswidget.h"
inditextpropertieswidget.cpp
Line 24 MUST BE #include "ui_inditextpropertieswidget.h"
linksingleelementwidget.cpp
Line 28 MUST BE #include "ui_linksingleelementwidget.h"
multipastedialog.cpp
Line 27 MUST BE #include "ui_multipastedialog.h"
potentialselectordialog.cpp
Line 28 MUST BE #include "ui_potentialselectordialog.h"
shapegraphicsitempropertieswidgetcpp
Line 24 MUST BE #include "ui_shapegraphicsitempropertieswidget.h"

There the headerfiles are already included.
So:
If the lines you mentioned do not cause compilation-errors, they do not need to be changed.

erreur de frappe trouvée dans les fichiers

../sources/ui/dynamicelementtextitemeditor.cpp
26 = #include "../ui_dynamicelementtextitemeditor.h"

_  devrait être  /
26 = #include "../ui/dynamicelementtextitemeditor.h"

../sources/ui/elementinfowidget.cpp
24  #include "../ui_elementinfowidget.h"

_ devrait être  /
24  #include "../ui/elementinfowidget.h"