--- evolution-2.3.6.1/configure.in
+++ evolution-2.3.6.1/configure.in
@@ -1677,7 +1677,6 @@
 plugins/mail-to-meeting/Makefile
 plugins/mail-to-task/Makefile
 plugins/mail-remote/Makefile
-plugins/mono/Makefile
 plugins/new-mail-notify/Makefile
 plugins/subject-thread/Makefile
 plugins/save-attachments/Makefile