diff --git a/UI/MailPartViewers/GNUmakefile b/UI/MailPartViewers/GNUmakefile
index a094e92..c82bf6f 100644
--- a/UI/MailPartViewers/GNUmakefile
+++ b/UI/MailPartViewers/GNUmakefile
@@ -25,7 +25,25 @@ MailPartViewers_OBJC_FILES += \
 	UIxMailPartMessageViewer.m	\
 	UIxMailPartICalViewer.m		\
 	\
-	UIxMailPartICalActions.m
+	UIxMailPartICalActions.m \
+	../../SoObjects/Mailer/SOGoMailBodyPart.m \
+	../../SoObjects/Mailer/SOGoHTMLMailBodyPart.m \
+	../../SoObjects/Mailer/SOGoCalendarMailBodyPart.m \
+	../../SoObjects/Mailer/SOGoMailAccounts.m \
+	../../SoObjects/Mailer/SOGoMailBaseObject.m \
+	../../SoObjects/Mailer/SOGoMailAccount.m \
+	../../SoObjects/Mailer/SOGoMailNamespace.m \
+	../../SoObjects/Mailer/SOGoDraftsFolder.m \
+	../../SoObjects/Mailer/SOGoSentFolder.m \
+	../../SoObjects/Mailer/SOGoTrashFolder.m \
+	../../SoObjects/Mailer/SOGoMailFolder.m \
+	../../SoObjects/Mailer/SOGoDraftObject.m \
+	../../SoObjects/Mailer/SOGoMailObject.m \
+	../../SoObjects/Appointments/SOGoEMailAlarmsManager.m \
+	../../SoObjects/Appointments/SOGoAppointmentObject.m \
+	../../SoObjects/Appointments/SOGoComponentOccurence.m \
+	../../SoObjects/Appointments/SOGoAppointmentOccurence.m \
+	../../SoObjects/Appointments/SOGoCalendarComponent.m
 
 MailPartViewers_RESOURCE_FILES += \
 	product.plist		\