patch 7.4.1480
Problem: Cannot add a pack direcory without loading a plugin.
Solution: Add the :packadd command.
diff --git a/src/proto/ex_cmds2.pro b/src/proto/ex_cmds2.pro
index 3eabcbd..e10f072 100644
--- a/src/proto/ex_cmds2.pro
+++ b/src/proto/ex_cmds2.pro
@@ -64,6 +64,7 @@
int do_in_runtimepath(char_u *name, int all, void (*callback)(char_u *fname, void *ck), void *cookie);
void source_packages(void);
void ex_loadplugin(exarg_T *eap);
+void ex_packadd(exarg_T *eap);
void ex_options(exarg_T *eap);
void ex_source(exarg_T *eap);
linenr_T *source_breakpoint(void *cookie);