diff --git a/cmake/FindPyQt5.cmake b/cmake/FindPyQt5.cmake
index b51fd0075e..87ee317e05 100644
--- a/cmake/FindPyQt5.cmake
+++ b/cmake/FindPyQt5.cmake
@@ -25,7 +25,7 @@ ELSE(EXISTS PYQT5_VERSION_STR)
   IF(SIP_BUILD_EXECUTABLE)
     # SIP >= 5.0 path
 
-    FILE(GLOB _pyqt5_metadata "${Python_SITEARCH}/PyQt5-*.dist-info/METADATA")
+    FILE(GLOB _pyqt5_metadata "@pyQt5PackageDir@/PyQt5-*.dist-info/METADATA")
     IF(_pyqt5_metadata)
       FILE(READ ${_pyqt5_metadata} _pyqt5_metadata_contents)
       STRING(REGEX REPLACE ".*\nVersion: ([^\n]+).*$" "\\1" PYQT5_VERSION_STR ${_pyqt5_metadata_contents})
@@ -34,8 +34,8 @@ ELSE(EXISTS PYQT5_VERSION_STR)
     ENDIF(_pyqt5_metadata)
 
     IF(PYQT5_VERSION_STR)
-      SET(PYQT5_MOD_DIR "${Python_SITEARCH}/PyQt5")
-      SET(PYQT5_SIP_DIR "${Python_SITEARCH}/PyQt5/bindings")
+      SET(PYQT5_MOD_DIR "@pyQt5PackageDir@/PyQt5")
+      SET(PYQT5_SIP_DIR "@pyQt5PackageDir@/PyQt5/bindings")
       FIND_PROGRAM(__pyuic5 "pyuic5")
       GET_FILENAME_COMPONENT(PYQT5_BIN_DIR ${__pyuic5} DIRECTORY)
 
diff --git a/cmake/FindQsci.cmake b/cmake/FindQsci.cmake
index 69e41c1fe9..5456c3d59b 100644
--- a/cmake/FindQsci.cmake
+++ b/cmake/FindQsci.cmake
@@ -24,7 +24,7 @@ ELSE(QSCI_MOD_VERSION_STR)
   IF(SIP_BUILD_EXECUTABLE)
     # SIP >= 5.0 path
 
-    FILE(GLOB _qsci_metadata "${Python_SITEARCH}/QScintilla*.dist-info/METADATA")
+    FILE(GLOB _qsci_metadata "@qsciPackageDir@/QScintilla*.dist-info/METADATA")
     IF(_qsci_metadata)
       FILE(READ ${_qsci_metadata} _qsci_metadata_contents)
       STRING(REGEX REPLACE ".*\nVersion: ([^\n]+).*$" "\\1" QSCI_MOD_VERSION_STR ${_qsci_metadata_contents})
@@ -33,7 +33,7 @@ ELSE(QSCI_MOD_VERSION_STR)
     ENDIF(_qsci_metadata)
 
     IF(QSCI_MOD_VERSION_STR)
-      SET(QSCI_SIP_DIR "${PYQT5_SIP_DIR}")
+      SET(QSCI_SIP_DIR "@qsciPackageDir@/PyQt5/bindings")
       SET(QSCI_FOUND TRUE)
     ENDIF(QSCI_MOD_VERSION_STR)
 
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 4cd19c3af4..668cc6a5e6 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -206,7 +206,7 @@ if (WITH_GUI)
     install(FILES ${QGIS_PYTHON_OUTPUT_DIRECTORY}/_gui.pyi DESTINATION ${QGIS_PYTHON_DIR})
   endif()
   if(QSCI_SIP_DIR)
-    set(SIP_EXTRA_OPTIONS ${SIP_EXTRA_OPTIONS} -I ${QSCI_SIP_DIR})
+    set(SIP_BUILD_EXTRA_OPTIONS ${SIP_BUILD_EXTRA_OPTIONS} --include-dir=${QSCI_SIP_DIR})
   else()
     message(STATUS "Qsci sip file not found - disabling bindings for derived classes")
     set(SIP_DISABLE_FEATURES ${SIP_DISABLE_FEATURES} HAVE_QSCI_SIP)