Some systems need PYTHON_INCLUDE_DIR2 for FindPythonLibs.cmake.

CMakeExternals/PythonQt.cmake

@@ -89,6 +89,7 @@ if(NOT DEFINED PYTHONQT_INSTALL_DIR)
       ${ep_common_cache_args}
       -DQT_QMAKE_EXECUTABLE:FILEPATH=${QT_QMAKE_EXECUTABLE}
       -DPYTHON_INCLUDE_DIR:PATH=${PYTHON_INCLUDE_DIR}
+      -DPYTHON_INCLUDE_DIR2:PATH=${PYTHON_INCLUDE_DIR2}
       -DPYTHON_LIBRARY:FILEPATH=${PYTHON_LIBRARY}
       ${ep_PythonQt_args}
     DEPENDS
@@ -107,6 +108,7 @@ mark_as_superbuild(
     PYTHONQT_INSTALL_DIR:PATH
     PYTHON_EXECUTABLE:FILEPATH # FindPythonInterp expects PYTHON_EXECUTABLE variable to be defined
     PYTHON_INCLUDE_DIR:PATH # FindPythonQt expects PYTHON_INCLUDE_DIR variable to be defined
+    PYTHON_INCLUDE_DIR2:PATH
     PYTHON_LIBRARY:FILEPATH # FindPythonQt expects PYTHON_LIBRARY variable to be defined
   LABELS "FIND_PACKAGE_VARS"
   )