Project ERROR: Library 'assimp' is not defined.

[jiapei100]

• Assimp installed from Official repo
• specified with --assimp=system for configuration
• found during configuration

QtQuick3D:
  Assimp ................................. yes
  System Assimp .......................... yes
Qt Scxml:
  ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
  SDL2 ................................... yes
Qt 3D:
  Assimp ................................. yes
  System Assimp .......................... yes

Qt5 Successfully built (namely, make with NO ERROR.
However, failed to make install with the following ERROR messages

make[3]: Entering directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins'
cd assetimporters/ && ( test -e Makefile || ....../qt-everywhere-src-5.15.5/qtbase/bin/qmake -o Makefile ....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters/assetimporters.pro ) && make -f Makefile install
make[4]: Entering directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters'
cd uip/ && ( test -e Makefile || ....../qt-everywhere-src-5.15.5/qtbase/bin/qmake -o Makefile ....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters/uip/uip.pro ) && make -f Makefile install
make[5]: Entering directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters/uip'
....../qt-everywhere-src-5.15.5/qtbase/bin/qmake -install qinstall -exe ../../../../plugins/assetimporters/libuip.so /opt/qt/5/plugins/assetimporters/libuip.so
strip --strip-unneeded /opt/qt/5/plugins/assetimporters/libuip.so
....../qt-everywhere-src-5.15.5/qtbase/bin/qmake -install qinstall ....../qt-everywhere-src-5.15.5/qtquick3d/lib/cmake/Qt5Quick3DAssetImport/Qt5Quick3DAssetImport_UipAssetImporterPlugin.cmake /opt/qt/5/lib/cmake/Qt5Quick3DAssetImport/Qt5Quick3DAssetImport_UipAssetImporterPlugin.cmake
make[5]: Leaving directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters/uip'
cd assimp/ && ( test -e Makefile || ....../qt-everywhere-src-5.15.5/qtbase/bin/qmake -o Makefile ....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters/assimp/assimp.pro ) && make -f Makefile install
Project ERROR: Library 'assimp' is not defined.
make[4]: *** [Makefile:85: sub-assimp-install_subtargets] Error 3
make[4]: Leaving directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins/assetimporters'
make[3]: *** [Makefile:59: sub-assetimporters-install_subtargets] Error 2
make[3]: Leaving directory '....../qt-everywhere-src-5.15.5/qtquick3d/src/plugins'
make[2]: *** [Makefile:206: sub-plugins-install_subtargets-ordered] Error 2
make[2]: Leaving directory '....../qt-everywhere-src-5.15.5/qtquick3d/src'
make[1]: *** [Makefile:62: sub-src-install_subtargets] Error 2
make[1]: Leaving directory '....../qt-everywhere-src-5.15.5/qtquick3d'
make: *** [Makefile:378: module-qtquick3d-install_subtargets] Error 2

Cheers

[jiapei100]

Problem solved by manually install the newest Assimp . I even found what is the incompatibility, but, it's pointless to point it out.
We ONLY need to rebuild and install the newest Assimp. It has NOTHING to do with Qt 5.15.5 ...

[SGaist]

Hi,

Might be a silly question but do you have the development package of assimp installed ?

[jiapei100]

@SGaist Thank you ...
Yes, I do have assimp installed from default Ubuntu repo...

[SGaist]

It's one thing to have the library installed. However do you have the complementary development package ?

If so, you should check the configuration logs to see why the assimp test failed.

[jiapei100]

Problem solved by manually install the newest Assimp . I even found what is the incompatibility, but, it's pointless to point it out.
We ONLY need to rebuild and install the newest Assimp. It has NOTHING to do with Qt 5.15.5 ...

[SGaist]

@jiapei100 said in Project ERROR: Library 'assimp' is not defined.:

Problem solved by manually install the newest Assimp . I even found what is the incompatibility, but, it's pointless to point it out.
We ONLY need to rebuild and install the newest Assimp. It has NOTHING to do with Qt 5.15.5 ...

Well, it would be nice to know for other people that might hit the same issue as you.