patch 7.4.2070
Problem:    Missing change to include file.
Solution:   Include the spell header file.
diff --git a/src/vim.h b/src/vim.h
index ed2ab4a..89eb48b 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2061,6 +2061,8 @@
 } assert_type_T;
 
 #include "ex_cmds.h"	    /* Ex command defines */
+#include "spell.h"	    /* spell checking stuff */
+
 #include "proto.h"	    /* function prototypes */
 
 /* This has to go after the include of proto.h, as proto/gui.pro declares