diff -rupN --no-dereference qtbase-everywhere-src-5.15.12/src/tools/bootstrap/bootstrap.pro qtbase-everywhere-src-5.15.12-new/src/tools/bootstrap/bootstrap.pro
--- qtbase-everywhere-src-5.15.12/src/tools/bootstrap/bootstrap.pro	2024-02-15 09:58:46.638332087 +0100
+++ qtbase-everywhere-src-5.15.12-new/src/tools/bootstrap/bootstrap.pro	2024-02-15 09:58:53.328133882 +0100
@@ -112,6 +112,7 @@ SOURCES += \
            ../../corelib/tools/qline.cpp \
            ../../corelib/tools/qversionnumber.cpp \
            ../../xml/dom/qdom.cpp \
+           ../../xml/dom/qdomhelpers.cpp \
            ../../xml/sax/qxml.cpp
 
 unix:SOURCES += ../../corelib/kernel/qcore_unix.cpp \