fix makefile, add header for vec.h

1 files changed, 1 insertions, 0 deletions

diff --git a/src/vec.h b/src/vec.h
index 9d32136..ccc0f6a 100644
--- a/src/vec.h
+++ b/src/vec.h
@@ -2,6 +2,7 @@
 #define ALGDS_VEC_H_
 
 #include <stdlib.h>
+#include <string.h>
 #include <stdio.h>
 
 #include "type_alias.h"