Patch-Source: https://bazaar.launchpad.net/~adamreichold/qpdfview/trunk/revision/2155

--- a/pdf-plugin.pro	2021-07-10 07:11:16 +0000
+++ b/pdf-plugin.pro	2023-12-20 13:58:08 +0000
@@ -11,6 +11,8 @@
 OBJECTS_DIR = objects-pdf
 MOC_DIR = moc-pdf
 
+CONFIG += c++17
+
 HEADERS = sources/model.h sources/pdfmodel.h sources/annotationwidgets.h sources/formfieldwidgets.h
 SOURCES = sources/pdfmodel.cpp sources/annotationwidgets.cpp sources/formfieldwidgets.cpp