patch 7.4.1384
Problem:    It is not easy to use a set of plugins and their dependencies.
Solution:   Add packages, ":loadopt", 'packpath'.
diff --git a/src/main.c b/src/main.c
index 57aeeed..f19ea1d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -637,6 +637,9 @@
 	source_runtime((char_u *)"plugin/**/*.vim", TRUE);
 # endif
 	TIME_MSG("loading plugins");
+
+	source_packages();
+	TIME_MSG("loading packages");
     }
 #endif