--- a/modules/QtPDF/src/PDFBackend.cpp 2020-05-31 15:53:04.028318169 +0200 +++ a/modules/QtPDF/src/PDFBackend.cpp 2020-05-31 15:53:35.765318879 +0200 @@ -15,6 +15,7 @@ #include #include #include +#include namespace QtPDF {