include: Add lmmsg.h.
diff --git a/include/lm.h b/include/lm.h
index 681440d..6151fd5 100644
--- a/include/lm.h
+++ b/include/lm.h
@@ -31,5 +31,6 @@
 #include <lmapibuf.h>
 #include <lmstats.h>
 #include <lmjoin.h>
+#include <lmmsg.h>
 
 #endif