v3.21.1 plugins build failing #1502

gc-user · 2026-01-15T12:37:06Z

gc-user
Jan 15, 2026

Trying to build the lastest version of nomacs (v3.22.0), I'm experiencing a build failure.

The build of nomacs itself seems to go through fine, but the building of the plugins fails with several errors, notably 2 types of errors.

There are several "was not declared in this scope" errors for different elements, and 2 times the error "error: cannot convert 'QIcon' to 'const QPixmap&'" popped up.

Not sure if this is a Qt v6.10 issue or something else. The commits mention qt 6.10, so that should (?) not be the cause here.

Here's the part where the errors start coming in during the building process:

[105/131] Building CXX object nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkSkewEstimator.cpp.o
FAILED: [code=1] nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkSkewEstimator.cpp.o 
/usr/bin/g++ -DHAVE_EXIV2_HPP -DNDEBUG -DNOMACS_VERSION=\"3.22\" -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DLL -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_NO_DEBUG_OUTPUT -DQT_PLUGIN -DQT_PRINTSUPPORT_LIB -DQT_SHARED -DQT_SVG_LIB -DQT_WIDGETS_LIB -DWITH_LIBRAW -DWITH_LIBTIFF -DWITH_OPENCV -DWITH_PLUGINS -DaffineTransformPlugin_EXPORTS -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/AffineTransformations/affineTransformPlugin_autogen/include -I/builddir/nomacs-3.22.0/ImageLounge/build -I/builddir/nomacs-3.22.0/ImageLounge/src -I/builddir/nomacs-3.22.0/ImageLounge/src/DkCore -I/builddir/nomacs-3.22.0/ImageLounge/src/DkGui -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/libqpsd -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/drif -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/AffineTransformations -I /usr/include/opencv4 -I /usr/include/qt6/QtWidgets -I /usr/include/qt6 -I /usr/include/qt6/QtCore -I /usr/lib64/qt6/mkspecs/linux-g++ -I /usr/include/qt6/QtGui -I /usr/include/qt6/QtNetwork -I /usr/include/qt6/QtPrintSupport -I /usr/include/qt6/QtConcurrent -I /usr/include/qt6/QtSvg -DNDEBUG -fstack-clash-protection -D_FORTIFY_SOURCE=2 -mtune=generic -O2    -ffile-prefix-map=/builddir/nomacs-3.22.0/ImageLounge/build=. -Wall -Wextra -Wpedantic -Wformat -Wformat-nonliteral -Wshadow -std=gnu++17 -fPIC -fPIC -MD -MT nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkSkewEstimator.cpp.o -MF nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkSkewEstimator.cpp.o.d -o nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkSkewEstimator.cpp.o -c /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp
In file included from /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp:28:
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.h:30: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   30 | #pragma warning(push, 0) // no warnings from includes - begin
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.h:40: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   40 | #pragma warning(pop) // no warnings from includes - end
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp: In constructor 'nmp::DkSkewEstimator::DkSkewEstimator(QWidget*)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp:37:43: warning: declaration of 'mainWin' shadows a member of 'nmp::DkSkewEstimator' [-Wshadow]
   37 | DkSkewEstimator::DkSkewEstimator(QWidget *mainWin)
      |                                  ~~~~~~~~~^~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.h:97:14: note: shadowed declaration is here
   97 |     QWidget *mainWin;
      |              ^~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp: In member function 'double nmp::DkSkewEstimator::getSkewAngle()':
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.cpp:103:43: error: 'CV_BGR2GRAY' was not declared in this scope
  103 |             cv::cvtColor(matImg, matGray, CV_BGR2GRAY);
      |                                           ^~~~~~~~~~~
[106/131] Building CXX object nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkImgTransformationsPlugin.cpp.o
FAILED: [code=1] nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkImgTransformationsPlugin.cpp.o 
/usr/bin/g++ -DHAVE_EXIV2_HPP -DNDEBUG -DNOMACS_VERSION=\"3.22\" -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DLL -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_NO_DEBUG_OUTPUT -DQT_PLUGIN -DQT_PRINTSUPPORT_LIB -DQT_SHARED -DQT_SVG_LIB -DQT_WIDGETS_LIB -DWITH_LIBRAW -DWITH_LIBTIFF -DWITH_OPENCV -DWITH_PLUGINS -DaffineTransformPlugin_EXPORTS -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/AffineTransformations/affineTransformPlugin_autogen/include -I/builddir/nomacs-3.22.0/ImageLounge/build -I/builddir/nomacs-3.22.0/ImageLounge/src -I/builddir/nomacs-3.22.0/ImageLounge/src/DkCore -I/builddir/nomacs-3.22.0/ImageLounge/src/DkGui -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/libqpsd -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/drif -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/AffineTransformations -I /usr/include/opencv4 -I /usr/include/qt6/QtWidgets -I /usr/include/qt6 -I /usr/include/qt6/QtCore -I /usr/lib64/qt6/mkspecs/linux-g++ -I /usr/include/qt6/QtGui -I /usr/include/qt6/QtNetwork -I /usr/include/qt6/QtPrintSupport -I /usr/include/qt6/QtConcurrent -I /usr/include/qt6/QtSvg -DNDEBUG -fstack-clash-protection -D_FORTIFY_SOURCE=2 -mtune=generic -O2    -ffile-prefix-map=/builddir/nomacs-3.22.0/ImageLounge/build=. -Wall -Wextra -Wpedantic -Wformat -Wformat-nonliteral -Wshadow -std=gnu++17 -fPIC -fPIC -MD -MT nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkImgTransformationsPlugin.cpp.o -MF nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkImgTransformationsPlugin.cpp.o.d -o nomacs-plugins/AffineTransformations/CMakeFiles/affineTransformPlugin.dir/src/DkImgTransformationsPlugin.cpp.o -c /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp
In file included from /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:28:
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.h:30: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   30 | #pragma warning(push, 0) // no warnings from includes - begin
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.h:54: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   54 | #pragma warning(pop, 0) // no warnings from includes - end
In file included from /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.h:57:
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.h:30: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   30 | #pragma warning(push, 0) // no warnings from includes - begin
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkSkewEstimator.h:40: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
   40 | #pragma warning(pop) // no warnings from includes - end
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp: In member function 'QPoint nmp::DkImgTransformationsViewPort::map(const QPointF&)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:190:9: error: 'mWorldMatrix' was not declared in this scope
  190 |     if (mWorldMatrix)
      |         ^~~~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:192:9: error: 'mImgMatrix' was not declared in this scope
  192 |     if (mImgMatrix)
      |         ^~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp: In member function 'virtual void nmp::DkImgTransformationsViewPort::paintEvent(QPaintEvent*)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:376:9: error: 'mWorldMatrix' was not declared in this scope
  376 |     if (mWorldMatrix)
      |         ^~~~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:377:37: error: 'mImgMatrix' was not declared in this scope
  377 |         painter.setWorldTransform((*mImgMatrix) * (*mWorldMatrix));
      |                                     ^~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp: In member function 'void nmp::DkImgTransformationsToolBar::createIcons()':
/builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.cpp:764:53: error: cannot convert 'QIcon' to 'const QPixmap&'
  764 |     icons[pan_icon].addPixmap(nmc::DkImage::loadIcon(":/nomacs/img/pan-checked.svg"), QIcon::Normal, QIcon::On);
      |                               ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                     |
      |                                                     QIcon
In file included from /usr/include/qt6/QtGui/qaction.h:11,
                 from /usr/include/qt6/QtGui/QAction:1,
                 from /builddir/nomacs-3.22.0/ImageLounge/plugins/AffineTransformations/src/DkImgTransformationsPlugin.h:32:
/usr/include/qt6/QtGui/qicon.h:229:35: note:   initializing argument 1 of 'void QIcon::addPixmap(const QPixmap&, Mode, State)'
  229 |     void addPixmap(const QPixmap &pixmap, Mode mode = Normal, State state = Off);
      |                    ~~~~~~~~~~~~~~~^~~~~~
[107/131] Building CXX object nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/paintPlugin_autogen/mocs_compilation.cpp.o
[108/131] Building CXX object nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/src/DkPaintPlugin.cpp.o
FAILED: [code=1] nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/src/DkPaintPlugin.cpp.o 
/usr/bin/g++ -DHAVE_EXIV2_HPP -DNDEBUG -DNOMACS_VERSION=\"3.22\" -DQT_CONCURRENT_LIB -DQT_CORE_LIB -DQT_DLL -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_NO_DEBUG -DQT_NO_DEBUG_OUTPUT -DQT_PLUGIN -DQT_PRINTSUPPORT_LIB -DQT_SHARED -DQT_SVG_LIB -DQT_WIDGETS_LIB -DWITH_LIBRAW -DWITH_LIBTIFF -DWITH_OPENCV -DWITH_PLUGINS -DpaintPlugin_EXPORTS -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/PaintPlugin/paintPlugin_autogen/include -I/builddir/nomacs-3.22.0/ImageLounge/build -I/builddir/nomacs-3.22.0/ImageLounge/src -I/builddir/nomacs-3.22.0/ImageLounge/src/DkCore -I/builddir/nomacs-3.22.0/ImageLounge/src/DkGui -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/libqpsd -I/builddir/nomacs-3.22.0/ImageLounge/3rdparty/drif -I/builddir/nomacs-3.22.0/ImageLounge/build/nomacs-plugins/PaintPlugin -I /usr/include/opencv4 -I /usr/include/qt6/QtWidgets -I /usr/include/qt6 -I /usr/include/qt6/QtCore -I /usr/lib64/qt6/mkspecs/linux-g++ -I /usr/include/qt6/QtGui -I /usr/include/qt6/QtNetwork -I /usr/include/qt6/QtPrintSupport -I /usr/include/qt6/QtConcurrent -I /usr/include/qt6/QtSvg -DNDEBUG -fstack-clash-protection -D_FORTIFY_SOURCE=2 -mtune=generic -O2    -ffile-prefix-map=/builddir/nomacs-3.22.0/ImageLounge/build=. -Wall -Wextra -Wpedantic -Wformat -Wformat-nonliteral -Wshadow -std=gnu++17 -fPIC -fPIC -MD -MT nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/src/DkPaintPlugin.cpp.o -MF nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/src/DkPaintPlugin.cpp.o.d -o nomacs-plugins/PaintPlugin/CMakeFiles/paintPlugin.dir/src/DkPaintPlugin.cpp.o -c /builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp: In member function 'virtual void nmp::DkPaintViewPort::mousePressEvent(QMouseEvent*)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:294:73: error: 'mapToImage' was not declared in this scope
  294 |             if (QRectF(QPointF(), viewport->getImage().size()).contains(mapToImage(event->pos()))) {
      |                                                                         ^~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp: In member function 'virtual void nmp::DkPaintViewPort::mouseMoveEvent(QMouseEvent*)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:342:77: error: 'mapToImage' was not declared in this scope
  342 |                 if (QRectF(QPointF(), viewport->getImage().size()).contains(mapToImage(event->pos()))) {
      |                                                                             ^~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp: In member function 'virtual void nmp::DkPaintViewPort::paintEvent(QPaintEvent*)':
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:410:9: error: 'mWorldMatrix' was not declared in this scope
  410 |     if (mWorldMatrix)
      |         ^~~~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:411:37: error: 'mImgMatrix' was not declared in this scope
  411 |         painter.setWorldTransform((*mImgMatrix) * (*mWorldMatrix)); // >DIR: using both matrices allows for correct resizing [16.10.2013 markus]
      |                                     ^~~~~~~~~~
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp: In member function 'void nmp::DkPaintToolBar::createIcons()':
/builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:620:53: error: cannot convert 'QIcon' to 'const QPixmap&'
  620 |     icons[pan_icon].addPixmap(nmc::DkImage::loadIcon(":/nomacs/img/pan-checked.svg"), QIcon::Normal, QIcon::On);
      |                               ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                     |
      |                                                     QIcon
In file included from /usr/include/qt6/QtGui/qaction.h:11,
                 from /usr/include/qt6/QtGui/QAction:1,
                 from /builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.h:30,
                 from /builddir/nomacs-3.22.0/ImageLounge/plugins/PaintPlugin/src/DkPaintPlugin.cpp:28:
/usr/include/qt6/QtGui/qicon.h:229:35: note:   initializing argument 1 of 'void QIcon::addPixmap(const QPixmap&, Mode, State)'
  229 |     void addPixmap(const QPixmap &pixmap, Mode mode = Normal, State state = Off);
      |                    ~~~~~~~~~~~~~~~^~~~~~
ninja: build stopped: subcommand failed.
=> ERROR: nomacs-3.22.0_0: do_build: '${make_cmd} ${makejobs} ${make_build_args} ${make_build_target}' exited with 1
=> ERROR:   in do_build() at common/build-style/cmake.sh:97

Answered by scrubbbbs

Jan 15, 2026

ImageLounge/plugins is now integrated and not a separate component, there is no need to fetch the plugins separately and maybe pass -DPLUGINS_DIR=<path> to cmake. So the build template needs to be adjusted to remove that dependency.

If you have further questions I'm happy to help. There some tips here specifically for package managers.

View full answer

scrubbbbs · 2026-01-15T13:48:22Z

scrubbbbs
Jan 15, 2026
Collaborator

ImageLounge/plugins was a submodule prior to 3.22. I suspect your copy of the repo was not properly updated and ImageLounge/plugins still points to the submodule. You can clone a fresh copy of the repo otherwise you will need to manually fix up your copy (if you have changes to merge).

1 reply

gc-user Jan 15, 2026
Author

Thanks for your reply!

I'll attach the plugins archive that was used for compiling.
plugins.tar.gz

The reason the path ImageLounge/plugins was used for the building of the plugins is because it is hard-coded (as build_wrksrc=ImageLounge plus a command to unpack the plugins archive into this path) into the nomacs build template of the package manager (xbps-src) of the distro I use. I only updated the versions and some other info (from the template for v3.17.xxxx). As I didn't know the path for plugins has changed, I didn't change that. If you could let me know what the new path is supposed to be, I'll update the path in the template and test if makes build process succeed.

Note: xbps-src doesn't use git for compiling, but downloads the source as archive files and unpacks them locally within the xbps-src build system.

scrubbbbs · 2026-01-15T15:44:57Z

scrubbbbs
Jan 15, 2026
Collaborator

ImageLounge/plugins is now integrated and not a separate component, there is no need to fetch the plugins separately and maybe pass -DPLUGINS_DIR=<path> to cmake. So the build template needs to be adjusted to remove that dependency.

If you have further questions I'm happy to help. There some tips here specifically for package managers.

1 reply

gc-user Jan 15, 2026
Author

Thanks for your reply.
I literally just wanted to correct my previous post because I realized that the plugins are now integrated in the package... :-)
There were enough clues... I only just noticed them...

Thanks for your help.
I just fixed the template accordingly (removing the extra sections for the plugin) and the build went through fine.

Sorry about that...

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v3.21.1 plugins build failing #1502

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v3.21.1 plugins build failing #1502

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