--- src/uimac/MyController.m.orig	2018-01-27 14:12:13.000000000 -0700
+++ src/uimac/MyController.m	2018-06-06 23:29:07.000000000 -0700
@@ -186,7 +186,7 @@
           (![[NSFileManager defaultManager]
               /* BCP 6/2016: Changed from /usr/bin/unison for El Capitan, per
                  suggestion from Alan Shutko */
-                 fileExistsAtPath:@"/usr/local/bin/unison"]) )
+                 fileExistsAtPath:@"__MACPORTS_PREFIX__/bin/unison"]) )
           [self raiseCltoolWindow:nil];
 }