patch 7.4.1480
Problem:    Cannot add a pack direcory without loading a plugin.
Solution:   Add the :packadd command.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index d17f4d5..94c2816 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1014,6 +1014,9 @@
 EX(CMD_print,		"print",	ex_print,
 			RANGE|WHOLEFOLD|COUNT|EXFLAGS|TRLBAR|CMDWIN|SBOXOK,
 			ADDR_LINES),
+EX(CMD_packadd,		"packadd",	ex_packadd,
+			BANG|FILE1|TRLBAR|SBOXOK|CMDWIN,
+			ADDR_LINES),
 EX(CMD_pclose,		"pclose",	ex_pclose,
 			BANG|TRLBAR,
 			ADDR_LINES),