diff -up xdrawchem-qt5/xdrawchem.pro.orig xdrawchem-qt5/xdrawchem.pro
--- xdrawchem-qt5/xdrawchem.pro.orig 2017-01-09 13:25:32.000000000 +0100
+++ xdrawchem-qt5/xdrawchem.pro 2019-11-27 12:57:54.007081078 +0100
@@ -45,7 +45,6 @@ ringdir.files = ring/*
doc.path = $${PREFIX}/share/xdrawchem/doc
doc.files = doc/*
INSTALLS += ringdir doc
-QMAKE_CXXFLAGS_DEBUG += -O0 -g3
CONFIG += debug
QT += xml network core widgets printsupport network gui