1 files changed, 3 insertions, 0 deletions
diff --git a/lock.c b/lock.c
index 35abade1..379eba86 100644
--- a/lock.c
+++ b/lock.c
@@ -6,6 +6,9 @@
 #include "config.h"
 
 #include <stdio.h>
+#ifdef HAVE_STRING_H
+#include <string.h> /* strcat() */
+#endif
 #if defined(STDC_HEADERS)
 #include <stdlib.h>
 #endif