From b3896eb65e9886da760b9ba35492dcf5feb3b4de Mon Sep 17 00:00:00 2001
From: Martchus <martchus@gmx.net>
Date: Thu, 4 Nov 2021 23:22:26 +0100
Subject: [PATCH] Check for relative paths also under install prefix

In the "normal" case none of the other variables are set
and thus relative paths (e.g. for the plugin directory)
cannot be resolved. This should still work when
CMAKE_FIND_ROOT_PATH is set beause we still check within
the other locations.
---
 cmake/modules/QtLinkage.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/modules/QtLinkage.cmake b/cmake/modules/QtLinkage.cmake
index 715ddb5..091f58f 100644
--- a/cmake/modules/QtLinkage.cmake
+++ b/cmake/modules/QtLinkage.cmake
@@ -192,7 +192,7 @@ function (query_qmake_variable_path QMAKE_VARIABLE)
         return() # skip if CMake version too old like on Leap 15.1
     endif ()
     foreach (ROOT_PATH ${CMAKE_FIND_ROOT_PATH} "")
-        foreach (PREFIX_PATH ${CMAKE_PREFIX_PATH} "")
+        foreach (PREFIX_PATH ${CMAKE_INSTALL_PREFIX} ${CMAKE_PREFIX_PATH} "")
             string(JOIN "/" FULL_PATH ${ROOT_PATH} ${PREFIX_PATH} ${VARIABLE_VALUE})
             if (EXISTS "${FULL_PATH}")
                 set("${QMAKE_VARIABLE}"