https://src.fedoraproject.org/rpms/kmymoney/blob/rawhide/f/kmymoney-fix-build-against-qt-6-10.patch
Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -183,7 +183,7 @@ if (PkgConfig_FOUND)
 endif()
 
 find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} REQUIRED COMPONENTS Core DBus Widgets Svg Xml Test PrintSupport)
-find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} OPTIONAL_COMPONENTS Sql Concurrent QuickWidgets)
+find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} OPTIONAL_COMPONENTS Sql SqlPrivate Concurrent QuickWidgets)
 
 find_package(KF${QT_MAJOR_VERSION} ${KF_MIN_VERSION} REQUIRED COMPONENTS Archive CoreAddons Config ConfigWidgets Crash I18n Completion KCMUtils ItemModels ItemViews Service XmlGui TextWidgets Notifications KIO)
 
@@ -425,12 +425,14 @@ kde_enable_exceptions()
 
 # There is no way to detect linker in cmake (see https://gitlab.kitware.com/cmake/cmake/issues/17596)
 # and linkers aren't compatible with each other, so we need to assume something
-if(CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "AppleClang"
+   AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
   set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-dead_strip -Wl,-undefined,error")
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-dead_strip -Wl,-undefined,error -Wl,-mark_dead_strippable_dylib")
   set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS}    -Wl,-dead_strip -Wl,-undefined,error")
 
-elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang"
+       AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
   set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,--as-needed")
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--as-needed")
   # TODO: remove multiple definitions of payeeIdentifierLoader::createPayeeIdentifierFromSqlDatabase
@@ -481,7 +483,9 @@ endif()
 # IDEA: Set on a per target base
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
-if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
+if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang" 
+   OR CMAKE_CXX_COMPILER_ID MATCHES "AppleClang"
+   AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
   # DebugKMM, Debugfull, Profile
   set(CMAKE_CXX_FLAGS_DEBUGKMM
       "-g -O2 -fno-reorder-blocks -fno-schedule-insns -fno-inline")
