cmake: use QT_INSTALL_PREFIX instead of CMAKE_PREFIX_PATH

CMakeLists.txt

@@ -229,11 +229,6 @@ if(UNIX)
     execute_process(COMMAND brew --prefix qt5 OUTPUT_VARIABLE QT5_DIR OUTPUT_STRIP_TRAILING_WHITESPACE)
     list(APPEND CMAKE_PREFIX_PATH ${QT5_DIR})
   endif()
-
-  if(CMAKE_PREFIX_PATH)
-    include_directories(${CMAKE_PREFIX_PATH}/include)
-    set(CMAKE_BUILD_RPATH "${CMAKE_PREFIX_PATH}/lib")
-  endif()
 endif()
 
 find_package(PkgConfig REQUIRED)
@@ -265,6 +260,14 @@ else()
   pkg_check_modules(QT5_PKG_CONFIG REQUIRED ${QT5_LIBRARIES_ABI})
 endif()
 
+get_target_property(QMAKE_IMPORTED_LOCATION Qt5::qmake IMPORTED_LOCATION)
+get_filename_component(QT_INSTALL_PREFIX "${QMAKE_IMPORTED_LOCATION}/../.." ABSOLUTE)
+
+if(APPLE AND CMAKE_PREFIX_PATH)
+  include_directories(${QT_INSTALL_PREFIX}/include)
+  set(CMAKE_BUILD_RPATH "${QT_INSTALL_PREFIX}/lib")
+endif()
+
 if(QT5_PKG_CONFIG_FOUND)
   set(QT5_PKG_CONFIG "QT5_PKG_CONFIG")
   if(STATIC)
@@ -276,10 +279,10 @@ if(QT5_PKG_CONFIG_FOUND)
       list(JOIN ${QT5_PKG_CONFIG}_LDFLAGS_OTHER " " ${QT5_PKG_CONFIG}_LDFLAGS_OTHER)
     endif()
     # temporal workaround for https://bugreports.qt.io/browse/QTBUG-80922
-    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${CMAKE_PREFIX_PATH}" ${QT5_PKG_CONFIG}_LDFLAGS_OTHER "${${QT5_PKG_CONFIG}_LDFLAGS_OTHER}")
-    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${CMAKE_PREFIX_PATH}" ${QT5_PKG_CONFIG}_LIBRARIES "${${QT5_PKG_CONFIG}_LIBRARIES}")
-    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${CMAKE_PREFIX_PATH}" ${QT5_PKG_CONFIG}_INCLUDE_DIRS "${${QT5_PKG_CONFIG}_INCLUDE_DIRS}")
-    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${CMAKE_PREFIX_PATH}" ${QT5_PKG_CONFIG}_LIBRARY_DIRS "${${QT5_PKG_CONFIG}_LIBRARY_DIRS}")
+    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${QT_INSTALL_PREFIX}" ${QT5_PKG_CONFIG}_LDFLAGS_OTHER "${${QT5_PKG_CONFIG}_LDFLAGS_OTHER}")
+    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${QT_INSTALL_PREFIX}" ${QT5_PKG_CONFIG}_LIBRARIES "${${QT5_PKG_CONFIG}_LIBRARIES}")
+    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${QT_INSTALL_PREFIX}" ${QT5_PKG_CONFIG}_INCLUDE_DIRS "${${QT5_PKG_CONFIG}_INCLUDE_DIRS}")
+    STRING(REPLACE "${QT5_PKG_CONFIG_Qt5Core_PREFIX}" "${QT_INSTALL_PREFIX}" ${QT5_PKG_CONFIG}_LIBRARY_DIRS "${${QT5_PKG_CONFIG}_LIBRARY_DIRS}")
   endif()
 
   set(QT5_LIBRARIES ${${QT5_PKG_CONFIG}_LIBRARIES} ${${QT5_PKG_CONFIG}_LDFLAGS_OTHER})