--- a/dpyfuncs.cc
+++ b/dpyfuncs.cc
@@ -28,6 +28,8 @@
 #include "metacam.h"
 #include "dpyfuncs.h"
 
+#include <cstring>
+
 static const char *rcsid __attribute__((unused))="$Id: dpyfuncs.cc,v 1.14 2004/08/21 17:54:20 daniel Exp $";
 
 void
--- a/ocontext.cc
+++ b/ocontext.cc
@@ -26,6 +26,7 @@
 
 #include <ctype.h>
 #include <cstdlib>
+#include <cstring>
 
 OutputContext::~OutputContext()
 {