https://github.com/QtExcel/QXlsx/pull/465

--- a/QXlsx/CMakeLists.txt
+++ b/QXlsx/CMakeLists.txt
@@ -114,7 +114,6 @@ set(SRC_FILES
     header/xlsxdrawing_p.h
     header/xlsxrichstring_p.h
     header/xlsxutility_p.h
-    header/xlsxreadsax.h
 )
 
 set(QXLSX_PUBLIC_HEADERS
@@ -134,6 +133,7 @@ set(QXLSX_PUBLIC_HEADERS
     header/xlsxdocument.h
     header/xlsxformat.h
     header/xlsxglobal.h
+    header/xlsxreadsax.h
     header/xlsxrichstring.h
     header/xlsxworkbook.h
     header/xlsxworksheet.h