If compiling in debug mode append a "d" to the Target and also link to that files

3rdparty/zint-2.4.4/backend_qt4/Zint.pro

@@ -26,7 +26,11 @@ unix{
 
 INCLUDEPATH += $$PWD/../backend
 DEFINES +=  _CRT_SECURE_NO_WARNINGS _CRT_NONSTDC_NO_WARNINGS ZINT_VERSION=\\\"$$VERSION\\\"
-TARGET = QtZint
+contains(CONFIG,release) {
+	TARGET = QtZint
+} else {
+	TARGET = QtZintd
+}
 
 !contains(DEFINES, NO_PNG) {
     SOURCES += $$PWD/../backend/png.c