PACKAGE_PREFIX_DIR points to wrong directory

[mferland]

Not totally sure, but it seems as if the PACKAGE_PREFIX_DIR variable that is set in qt/cmake/AppStreamQtConfig.cmake.in is wrong.

For example, when building the 'libdiscover' library from KDE under the Yocto build system, I get the following build error:

| CMake Error in libdiscover/CMakeLists.txt:
|   Imported target "AppStreamQt" includes non-existent path
| 
|     "/path/to/build/tmp/work/core2-64-poky-linux/discover/6.1.3/recipe-sysroot/include/"
| 
|   in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:
| 
|   * The path was deleted, renamed, or moved to another location.
| 
|   * An install or uninstall procedure did not complete successfully.
| 
|   * The installation package was faulty and references files it does not
|   provide.

The path should have been:

/path/to/build/tmp/work/core2-64-poky-linux/discover/6.1.3/recipe-sysroot/usr/include

instead of:

/path/to/build/tmp/work/core2-64-poky-linux/discover/6.1.3/recipe-sysroot/include

One way I got libdiscover to compile correctly is by appyling the following patch to appstream:

qt/cmake/AppStreamQtConfig.cmake.in
@@ -1,5 +1,5 @@
 
-get_filename_component(PACKAGE_PREFIX_DIR "${CMAKE_CURRENT_LIST_DIR}/../../../../" ABSOLUTE)
+get_filename_component(PACKAGE_PREFIX_DIR "${CMAKE_CURRENT_LIST_DIR}/../../../" ABSOLUTE)
 
 # Use original install prefix when loaded through a "/usr move"
 # cross-prefix symbolic link such as /lib -> /usr/lib.
--