--- fvwm1-1.24r.orig/libs/hostname.c
+++ fvwm1-1.24r/libs/hostname.c
@@ -1,4 +1,5 @@
 #include "../configure.h"
+#include <string.h>
 
 #if HAVE_UNAME
 /* define mygethostname() by using uname() */