Just to make sure:

Cmake prints a section
    -- The following OPTIONAL packages have been found:

and in that section you should see (among others)
    * KDevelop-PG-Qt
    * KDevPlatform (required version >= 5.1.2)
    * KDevPHP

Is that the case for you?

Does your self-compiled Qt 5.15.5 installation coexist with an OS provided Qt version?
I ask because I see a mixture of libraries, some originating from /usr/local/Qt-5.15.5/lib but others from /usr/lib/x86_64-linux-gnu (?)

Thanks for looking at this, Oliver. Indeed, I had an older Qt version on my system but wasn't aware of it.

I disabled building the unit tests and renamed all of the pkg-config files that referred to the older version so that it will pick up the newer Qt in /usr/local/lib and /usr/local/include. Now it is building OK.

Oops ... I should have waited until the end of the build! Looks like there are still problems with some of the code picking up the older version.

How can I instruct the CMake build NOT to look for QNetworkRequest? Why does Umbrello need that?

Here is the entire build output:
========================================================
bob@bobs-laptop:~/code/umbrello/build$ cmake -DCMAKE_INSTALL_PREFIX=$HOME/umbrello -DCMAKE_BUILD_TYPE=Debug  ../
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Deprecation Warning at CMakeLists.txt:6 (cmake_policy):
  The OLD behavior for policy CMP0028 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.


-- Looking for __GLIBC__
-- Looking for __GLIBC__ - found
-- Performing Test _OFFT_IS_64BIT
-- Performing Test _OFFT_IS_64BIT - Success
-- Performing Test HAVE_DATE_TIME
-- Performing Test HAVE_DATE_TIME - Success
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5Archive)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5Archive: /usr/lib/x86_64-linux-gnu/cmake/KF5Archive/KF5ArchiveConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5Completion) does not match the name of the calling package (KF5).  This
  can lead to problems in calling code that expects `find_package` result
  variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5Completion: /usr/lib/x86_64-linux-gnu/cmake/KF5Completion/KF5CompletionConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5Config)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5Config: /usr/lib/x86_64-linux-gnu/cmake/KF5Config/KF5ConfigConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5CoreAddons) does not match the name of the calling package (KF5).  This
  can lead to problems in calling code that expects `find_package` result
  variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5CoreAddons: /usr/lib/x86_64-linux-gnu/cmake/KF5CoreAddons/KF5CoreAddonsConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5Crash)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5Crash: /usr/lib/x86_64-linux-gnu/cmake/KF5Crash/KF5CrashConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5DocTools) does not match the name of the calling package (KF5).  This
  can lead to problems in calling code that expects `find_package` result
  variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5DocTools: /usr/lib/x86_64-linux-gnu/cmake/KF5DocTools/KF5DocToolsConfig.cmake (found version "5.44.0") 
-- Found Gettext: /usr/bin/msgmerge (found version "0.19.8.1") 
-- Found PythonInterp: /usr/bin/python (found version "2.7.17") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5I18n)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5I18n: /usr/lib/x86_64-linux-gnu/cmake/KF5I18n/KF5I18nConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5IconThemes) does not match the name of the calling package (KF5).  This
  can lead to problems in calling code that expects `find_package` result
  variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5IconThemes: /usr/lib/x86_64-linux-gnu/cmake/KF5IconThemes/KF5IconThemesConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5KDELibs4Support) does not match the name of the calling package (KF5).
  This can lead to problems in calling code that expects `find_package`
  result variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5KDELibs4Support: /usr/lib/x86_64-linux-gnu/cmake/KF5KDELibs4Support/KF5KDELibs4SupportConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5KIO)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5KIO: /usr/lib/x86_64-linux-gnu/cmake/KF5KIO/KF5KIOConfig.cmake (found version "5.44.0") 
-- Looking for dgettext
-- Looking for dgettext - found
-- Found Gettext: built in libc
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5TextEditor) does not match the name of the calling package (KF5).  This
  can lead to problems in calling code that expects `find_package` result
  variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5TextEditor: /usr/lib/x86_64-linux-gnu/cmake/KF5TextEditor/KF5TextEditorConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5WidgetsAddons) does not match the name of the calling package (KF5).
  This can lead to problems in calling code that expects `find_package`
  result variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5WidgetsAddons: /usr/lib/x86_64-linux-gnu/cmake/KF5WidgetsAddons/KF5WidgetsAddonsConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args`
  (KF5WindowSystem) does not match the name of the calling package (KF5).
  This can lead to problems in calling code that expects `find_package`
  result variables (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5WindowSystem: /usr/lib/x86_64-linux-gnu/cmake/KF5WindowSystem/KF5WindowSystemConfig.cmake (found version "5.44.0") 
CMake Warning (dev) at /usr/local/cmake-3.19.3-Linux-x86_64/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:426 (message):
  The package name passed to `find_package_handle_standard_args` (KF5XmlGui)
  does not match the name of the calling package (KF5).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  /usr/share/ECM/find-modules/FindKF5.cmake:78 (find_package_handle_standard_args)
  CMakeLists.txt:114 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Found KF5XmlGui: /usr/lib/x86_64-linux-gnu/cmake/KF5XmlGui/KF5XmlGuiConfig.cmake (found version "5.44.0") 
-- Found KF5: success (found version "5.44.0") found components: Archive Completion Config CoreAddons Crash DocTools I18n IconThemes KDELibs4Support KIO TextEditor WidgetsAddons WindowSystem XmlGui 
CMake Deprecation Warning at CMakeLists.txt:181 (cmake_policy):
  The OLD behavior for policy CMP0071 will be removed from a future version
  of CMake.

  The cmake-policies(7) manual explains that the OLD behaviors of all
  policies are deprecated and that a policy should be set to OLD only under
  specific short-term circumstances.  Projects should be ported to the NEW
  behavior and not rely on setting a policy to OLD.


-- Using umbrello version 2.31.70-a04917ddc
-- Using automoc4 version 
-- Using cmake version 3.19.3
-- Using Qt version 
-- Found LibXslt: /usr/lib/x86_64-linux-gnu/libxslt.so (found version "1.1.29") 
-- Found LibXml2: /usr/lib/x86_64-linux-gnu/libxml2.so (found version "2.9.4") 
-- Enable unstable feature WIDGET_SHOW_DOC - use '#ifdef ENABLE_WIDGET_SHOW_DOC' in related code
-- Enable unstable feature NEW_CODE_GENERATORS - use '#ifdef ENABLE_NEW_CODE_GENERATORS' in related code
-- Enable unstable feature UML_OBJECTS_WINDOW - use '#ifdef ENABLE_UML_OBJECTS_WINDOW' in related code
-- Enable unstable feature XMIRESOLUTION - use '#ifdef ENABLE_XMIRESOLUTION' in related code
-- Enable unstable feature COMBINED_STATE_DIRECT_EDIT - use '#ifdef ENABLE_COMBINED_STATE_DIRECT_EDIT' in related code
-- Enable unstable feature OBJECT_DIAGRAM - use '#ifdef ENABLE_OBJECT_DIAGRAM' in related code
-- Found Doxygen: /usr/local/bin/doxygen (found version "1.8.20") found components: doxygen dot 
-- The following OPTIONAL packages have been found:

 * Qt5WebKitWidgets (required version >= 5.2.0)
 * KF5Emoticons (required version >= 5.44.0)
 * KF5GuiAddons (required version >= 5.44.0)
 * KF5ItemModels (required version >= 5.44.0)
 * KF5Notifications (required version >= 5.44.0)
 * KF5UnitConversion (required version >= 5.44.0)
 * KF5Service (required version >= 5.44.0)
 * KF5Bookmarks (required version >= 5.44.0)
 * KF5ItemViews (required version >= 5.44.0)
 * KF5JobWidgets (required version >= 5.44.0)
 * KF5Solid (required version >= 5.44.0)
 * KF5Sonnet (required version >= 5.44.0)
 * KF5TextWidgets (required version >= 5.44.0)
 * KF5Parts (required version >= 5.44.0)
 * KF5Auth (required version >= 5.44.0)
 * KF5Codecs (required version >= 5.44.0)
 * KF5ConfigWidgets (required version >= 5.44.0)
 * Doxygen

-- The following REQUIRED packages have been found:

 * ECM (required version >= 1.1.0)
 * Qt5Svg
 * Qt5Test
 * Qt5 (required version >= 5.2.0)
 * KF5Archive (required version >= 5.44.0)
 * KF5Crash (required version >= 5.44.0)
 * KF5DocTools (required version >= 5.44.0)
 * Qt5Gui (required version >= 5.7.0)
 * KF5IconThemes (required version >= 5.44.0)
 * Qt5PrintSupport (required version >= 5.7.0)
 * KF5KDELibs4Support
 * KF5Completion (required version >= 5.44.0)
 * Gettext
 * PythonInterp
 * KF5I18n (required version >= 5.44.0)
 * KF5TextEditor
 * KF5WindowSystem
 * KF5CoreAddons (required version >= 5.44.0)
 * Qt5Core (required version >= 5.7.0)
 * Qt5Xml (required version >= 5.7.0)
 * KF5Config (required version >= 5.44.0)
 * Qt5Widgets (required version >= 5.7.0)
 * KF5WidgetsAddons (required version >= 5.44.0)
 * KF5XmlGui
 * KF5
 * LibXslt, A library to transform XMLfiles into other XML files., <http://xmlsoft.org/XSLT>
 * LibXml2, Libraries used to develop XML applications., <http://xmlsoft.org>

-- Configuring done
CMake Warning at umbrello/CMakeLists.txt:581 (add_executable):
  Cannot generate a safe runtime search path for target umbrello because
  files in some directories may conflict with libraries in implicit
  directories:

    runtime library [libQt5Network.so.5] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
      /usr/local/Qt-5.15.5/lib

  Some of these libraries may not be found correctly.


-- Generating done
-- Build files have been written to: /home/bob/code/umbrello/build
bob@bobs-laptop:~/code/umbrello/build$ make
Scanning dependencies of target pofiles-5462745a688aeae5faba7a2692c4b5d8
[  0%] Generating mo...
[  0%] Built target pofiles-5462745a688aeae5faba7a2692c4b5d8
Scanning dependencies of target tsfiles-5462745a688aeae5faba7a2692c4b5d8
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[  0%] Built target tsfiles-5462745a688aeae5faba7a2692c4b5d8
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[ 69%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/foreignkeyconstraint.cpp.o
[ 69%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/node.cpp.o
[ 69%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/operation.cpp.o
[ 70%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/package.cpp.o
[ 70%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/port.cpp.o
[ 70%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/stereotype.cpp.o
[ 70%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/template.cpp.o
[ 71%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlattributelist.cpp.o
[ 71%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlcanvasobject.cpp.o
[ 71%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlclassifierlistitemlist.cpp.o
[ 71%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlentityattributelist.cpp.o
[ 72%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlentityconstraintlist.cpp.o
[ 72%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlobject.cpp.o
[ 72%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlobjectlist.cpp.o
[ 72%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/umlrole.cpp.o
[ 72%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/usecase.cpp.o
[ 73%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/uniqueconstraint.cpp.o
[ 73%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/instance.cpp.o
[ 73%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml1model/instanceattribute.cpp.o
[ 73%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/activitywidget.cpp.o
[ 74%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/actorwidget.cpp.o
[ 74%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/artifactwidget.cpp.o
[ 74%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/associationwidgetrole.cpp.o
[ 74%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/associationline.cpp.o
[ 75%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/associationwidget.cpp.o
[ 75%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/boxwidget.cpp.o
[ 75%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/categorywidget.cpp.o
[ 75%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/childwidgetplacement.cpp.o
[ 76%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/childwidgetplacementpin.cpp.o
[ 76%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/childwidgetplacementport.cpp.o
[ 76%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/classifierwidget.cpp.o
[ 76%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/combinedfragmentwidget.cpp.o
[ 77%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/componentwidget.cpp.o
[ 77%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/datatypewidget.cpp.o
[ 77%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/diagramproxywidget.cpp.o
[ 77%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/entitywidget.cpp.o
[ 77%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/enumwidget.cpp.o
[ 78%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/floatingdashlinewidget.cpp.o
[ 78%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/floatingtextwidget.cpp.o
[ 78%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/forkjoinwidget.cpp.o
[ 78%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/interfacewidget.cpp.o
[ 79%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/layoutgrid.cpp.o
[ 79%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/linkwidget.cpp.o
[ 79%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/messagewidget.cpp.o
[ 79%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/nodewidget.cpp.o
[ 80%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/notewidget.cpp.o
[ 80%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/objectnodewidget.cpp.o
[ 80%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/objectwidget.cpp.o
[ 80%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/packagewidget.cpp.o
[ 81%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/pinportbase.cpp.o
[ 81%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/pinwidget.cpp.o
[ 81%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/portwidget.cpp.o
[ 81%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/preconditionwidget.cpp.o
[ 82%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/regionwidget.cpp.o
[ 82%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/seqlinewidget.cpp.o
[ 82%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/signalwidget.cpp.o
[ 82%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/statewidget.cpp.o
[ 83%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/toolbarstateonewidget.cpp.o
[ 83%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/umlwidget.cpp.o
[ 83%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/usecasewidget.cpp.o
[ 83%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/widget_factory.cpp.o
[ 83%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/widget_utils.cpp.o
[ 84%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/widgetbase.cpp.o
[ 84%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/widgetlist_utils.cpp.o
[ 84%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlwidgets/statusbartoolbutton.cpp.o
[ 84%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/assocrules.cpp.o
[ 85%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/basictypes.cpp.o
[ 85%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/birdview.cpp.o
[ 85%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/codeviewerstate.cpp.o
[ 85%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/cmdlineexportallviewsevent.cpp.o
[ 86%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/diagramswindow.cpp.o
[ 86%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/diagram_utils.cpp.o
[ 86%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/file_utils.cpp.o
[ 86%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/objectswindow.cpp.o
[ 87%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/docwindow.cpp.o
[ 87%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/dotgenerator.cpp.o
[ 87%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/icon_utils.cpp.o
[ 87%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/import_argo.cpp.o
[ 88%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/import_rose.cpp.o
[ 88%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/layoutgenerator.cpp.o
[ 88%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/model_utils.cpp.o
[ 88%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/object_factory.cpp.o
[ 88%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/optionstate.cpp.o
[ 89%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/petalnode.cpp.o
[ 89%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/petaltree2uml.cpp.o
[ 89%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/stereotypeswindow.cpp.o
[ 89%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstatearrow.cpp.o
[ 90%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstateassociation.cpp.o
[ 90%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstate.cpp.o
[ 90%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstatefactory.cpp.o
[ 90%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstatemessages.cpp.o
[ 91%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstateother.cpp.o
[ 91%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/toolbarstatepool.cpp.o
[ 91%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlappprivate.cpp.o
[ 91%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uml.cpp.o
[ 92%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umldoc.cpp.o
[ 92%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umllistview.cpp.o
[ 92%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umllistviewitem.cpp.o
[ 92%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlscene.cpp.o
[ 93%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlview.cpp.o
[ 93%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlviewimageexporterall.cpp.o
[ 93%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlviewimageexporter.cpp.o
[ 93%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umlviewimageexportermodel.cpp.o
[ 94%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/uniqueid.cpp.o
[ 94%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/worktoolbar.cpp.o
[ 94%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/umbrellosettings.cpp.o
[ 94%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/models/diagramsmodel.cpp.o
[ 94%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/models/objectsmodel.cpp.o
[ 95%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/models/stereotypesmodel.cpp.o
[ 95%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/libumbrello_autogen/EWIEGA46WW/qrc_icons.cpp.o
[ 95%] Building CXX object umbrello/CMakeFiles/libumbrello.dir/libumbrello_autogen/EJRQKI7XPS/qrc_ui.cpp.o
[ 95%] Linking CXX static library libumbrello.a
[ 95%] Built target libumbrello
Scanning dependencies of target umbrello_autogen
[ 95%] Automatic MOC for target umbrello
[ 95%] Built target umbrello_autogen
Scanning dependencies of target umbrello
[ 96%] Building CXX object umbrello/CMakeFiles/umbrello.dir/umbrello_autogen/mocs_compilation.cpp.o
[ 96%] Building CXX object umbrello/CMakeFiles/umbrello.dir/main.cpp.o
[ 96%] Linking CXX executable umbrello5
/usr/local/Qt-5.15.5/lib/libQt5Qml.so.5: undefined reference to `QNetworkRequest::QNetworkRequest()@Qt_5'
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to `QMetaObjectPrivate::signalOffset(QMetaObject const*)@Qt_5'
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to `QMutexPool::globalInstanceGet(void const*)@Qt_5_PRIVATE_API'
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to `QMetaCallEvent::QMetaCallEvent(QtPrivate::QSlotObjectBase*, QObject const*, int, int, int*, void**, QSemaphore*)@Qt_5_PRIVATE_API'
/usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to `QIPAddressUtils::toString(QString&, unsigned char*)@Qt_5'
/usr/local/Qt-5.15.5/lib/libQt5Quick.so.5: undefined reference to `QAbstractSocket::errorOccurred(QAbstractSocket::SocketError)@Qt_5'
collect2: error: ld returned 1 exit status
umbrello/CMakeFiles/umbrello.dir/build.make:121: recipe for target 'umbrello/umbrello5' failed
make[2]: *** [umbrello/umbrello5] Error 1
CMakeFiles/Makefile2:505: recipe for target 'umbrello/CMakeFiles/umbrello.dir/all' failed
make[1]: *** [umbrello/CMakeFiles/umbrello.dir/all] Error 2
Makefile:159: recipe for target 'all' failed
make: *** [all] Error 2
===============================================

(In reply to Robert Hairgrove from comment #3)
> 
> How can I instruct the CMake build NOT to look for QNetworkRequest? Why does
> Umbrello need that?

It looks like it's not Umbrello that needs it but rather it is an indirect dependency incurred by Qt5Qml:

  [ 96%] Linking CXX executable umbrello5
  /usr/local/Qt-5.15.5/lib/libQt5Qml.so.5: undefined reference to `QNetworkRequest::QNetworkRequest()@Qt_5'
  /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to [...]

My guess is that your Qt5.15 build somehow did not install the Qt5Network library, otherwise libQt5Network.so.5.15.5 should have been picked up from /usr/local/Qt-5.15.5/lib (picking up  /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5 is wrong).

(In reply to Oliver Kellogg from comment #4)
> (In reply to Robert Hairgrove from comment #3)
> > 
> > How can I instruct the CMake build NOT to look for QNetworkRequest? Why does
> > Umbrello need that?
> 
> It looks like it's not Umbrello that needs it but rather it is an indirect
> dependency incurred by Qt5Qml:
> 
>   [ 96%] Linking CXX executable umbrello5
>   /usr/local/Qt-5.15.5/lib/libQt5Qml.so.5: undefined reference to
> `QNetworkRequest::QNetworkRequest()@Qt_5'
>   /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5: undefined reference to
> [...]
> 
> My guess is that your Qt5.15 build somehow did not install the Qt5Network
> library, otherwise libQt5Network.so.5.15.5 should have been picked up from
> /usr/local/Qt-5.15.5/lib (picking up 
> /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5 is wrong).

Both of those libraries are there under /usr/local/Qt-5.15.5/lib. I use QtNetwork in another project which is built on Qt 5.15.5, and this works just fine. However, I am using qmake and Qt Creator to build the other project.

I suspect this is somehow compiled into the KDE support libraries somewhere?

At any rate, how can I get rid of Umbrello's dependency on Qml? I don't see any need for it at all. Does it have anything to do with the KFE online help system?

And if i cannot remove the dependency, why doesn't it build correctly, considering that all of the Qt 5.15.5 libraries are installed correctly?

(In reply to Robert Hairgrove from comment #5)
> ... KFE online help system

Should be "KDE online help..."

(In reply to Robert Hairgrove from comment #5)
> (In reply to Oliver Kellogg from comment #4)
> > [...]
> > My guess is that your Qt5.15 build somehow did not install the Qt5Network
> > library, otherwise libQt5Network.so.5.15.5 should have been picked up from
> > /usr/local/Qt-5.15.5/lib (picking up 
> > /usr/lib/x86_64-linux-gnu/libQt5Network.so.5.9.5 is wrong).
> 
> Both of those libraries are there under /usr/local/Qt-5.15.5/lib. I use
> QtNetwork in another project which is built on Qt 5.15.5, and this works
> just fine. However, I am using qmake and Qt Creator to build the other
> project.
> 
> I suspect this is somehow compiled into the KDE support libraries somewhere?

Yes, it's a multi level indirection - Umbrello doesn't require Qml itself but some of the required libs do.

> At any rate, how can I get rid of Umbrello's dependency on Qml? I don't see
> any need for it at all. Does it have anything to do with the KFE online help
> system?

I don't know.
Are you using current git master? If not, it could be worth giving it a try.
I have recently removed dependency on QtWebKit and KDElibs4Support.
Also you might try building without the PHP import and QCH:
    cmake -DBUILD_PHP_IMPORT=0 -DBUILD_QCH=0 [...]

> And if i cannot remove the dependency, why doesn't it build correctly,
> considering that all of the Qt 5.15.5 libraries are installed correctly?

Hm, not sure.
I made a build of the release/22.12 branch using
     make VERBOSE=1 >& make.log
and in the make.log I found the line where the umbrello exe is linked.
That line shows the complete list of Qt shared libs linked in.
I extracted that list and ran the following shellscript:

#!/bin/bash
#

for i in \
  /usr/lib64/libKF5KDELibs4Support.so.5.101.0 \
  /usr/lib64/libKF5UnitConversion.so.5.101.0 \
  /usr/lib64/libKDevPlatformShell.so.5.10.221200 \
  /usr/lib64/libKF5KIOFileWidgets.so.5.101.0 \
  /usr/lib64/libKF5Bookmarks.so.5.101.0 \
  /usr/lib64/libKF5Notifications.so.5.101.0 \
  /usr/lib64/libkdevphpparser.so \
  /usr/lib64/libKDevPlatformLanguage.so.5.10.221200 \
  /usr/lib64/libKF5ThreadWeaver.so.5.101.0 \
  /usr/lib64/libKDevPlatformSerialization.so.5.10.221200 \
  /usr/lib64/libKDevPlatformSublime.so.5.10.221200 \
  /usr/lib64/libKDevPlatformOutputView.so.5.10.221200 \
  /usr/lib64/libKDevPlatformUtil.so.5.10.221200 \
  /usr/lib64/libKDevPlatformInterfaces.so.5.10.221200 \
  /usr/lib64/libKF5TextEditor.so.5.101.0 \
  /usr/lib64/libKF5Parts.so.5.101.0 \
  /usr/lib64/libKF5XmlGui.so.5.101.0 \
  /usr/lib64/libQt5PrintSupport.so.5.15.7 \
  /usr/lib64/libKF5TextWidgets.so.5.101.0 \
  /usr/lib64/libKF5KIOWidgets.so.5.101.0 \
  /usr/lib64/libKF5Completion.so.5.101.0 \
  /usr/lib64/libKF5IconThemes.so.5.101.0 \
  /usr/lib64/libQt5Svg.so.5.15.7 \
  /usr/lib64/libKF5Archive.so.5.101.0 \
  /usr/lib64/libKF5ConfigWidgets.so.5.101.0 \
  /usr/lib64/libKF5Auth.so.5.101.0 \
  /usr/lib64/libKF5Codecs.so.5.101.0 \
  /usr/lib64/libKF5ConfigGui.so.5.101.0 \
  /usr/lib64/libKF5GuiAddons.so.5.101.0 \
  /usr/lib64/libKF5Solid.so.5.101.0 \
  /usr/lib64/libKF5KIOGui.so.5.101.0 \
  /usr/lib64/libKF5KIOCore.so.5.101.0 \
  /usr/lib64/libKF5Crash.so.5.101.0 \
  /usr/lib64/libKF5WindowSystem.so.5.101.0 \
  /usr/lib64/libX11.so \
  /usr/lib64/libQt5Concurrent.so.5.15.7 \
  /usr/lib64/libKF5AuthCore.so.5.101.0 \
  /usr/lib64/libKF5Service.so.5.101.0 \
  /usr/lib64/libQt5Xml.so.5.15.7 \
  /usr/lib64/libKF5I18n.so.5.101.0 \
  /usr/lib64/libKF5ConfigCore.so.5.101.0 \
  /usr/lib64/libKF5JobWidgets.so.5.101.0 \
  /usr/lib64/libKF5CoreAddons.so.5.101.0 \
  /usr/lib64/libKF5WidgetsAddons.so.5.101.0 \
  /usr/lib64/libQt5DBus.so.5.15.7 \
  /usr/lib64/libKF5SyntaxHighlighting.so.5.101.0 \
  /usr/lib64/libQt5Network.so.5.15.7 \
  /usr/lib64/libKF5ItemViews.so.5.101.0 \
  /usr/lib64/libKF5SonnetUi.so.5.101.0 \
  /usr/lib64/libQt5Widgets.so.5.15.7 \
  /usr/lib64/libQt5Gui.so.5.15.7 \
  /usr/lib64/libQt5Core.so.5.15.7
do
  references_qml=$(ldd $i | grep -i qml)
  if [ -n "$references_qml" ]; then
    echo "$i : $references_qml"
  fi
done

On my system, that gives:

/usr/lib64/libKDevPlatformShell.so.5.10.221200 :        libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f0c0f000000)
/usr/lib64/libkdevphpparser.so :        libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f11bbe00000)
/usr/lib64/libKDevPlatformLanguage.so.5.10.221200 :     libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f0e0ce00000)
/usr/lib64/libKDevPlatformSerialization.so.5.10.221200 :        libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f37ffa00000)
/usr/lib64/libKDevPlatformOutputView.so.5.10.221200 :   libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007fde4c000000)
/usr/lib64/libKDevPlatformUtil.so.5.10.221200 :         libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f6341200000)
/usr/lib64/libKDevPlatformInterfaces.so.5.10.221200 :   libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007fda92200000)
/usr/lib64/libKF5TextEditor.so.5.101.0 :        libQt5Qml.so.5 => /lib64/libQt5Qml.so.5 (0x00007f1a67800000)