Index: mplex/zalphastrm_in.cpp
--- mplex/zalphastrm_in.cpp.orig
+++ mplex/zalphastrm_in.cpp
@@ -23,6 +23,7 @@
 #include "config.h"
 #include <math.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "zalphastrm.hpp"
 #include "interact.hpp"