- include strings.h

Thanks to Rich Felker for pointing this out.

editors/awk.c

@@ -12,6 +12,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
+#include <strings.h>
 #include <time.h>
 #include <math.h>
 #include <ctype.h>

editors/vi.c

@@ -53,6 +53,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <termios.h>
 #include <unistd.h>
 #include <sys/ioctl.h>

libbb/obscure.c

@@ -42,6 +42,7 @@
 #include <ctype.h>
 #include <unistd.h>
 #include <string.h>
+#include <strings.h>
 
 #include "libbb.h"
 

libbb/u_signal_names.c

@@ -11,6 +11,7 @@
 #include <signal.h>
 #include <ctype.h>
 #include <string.h>
+#include <strings.h>
 #include <stdlib.h>
 #include <stdio.h>
 

networking/wget.c

@@ -12,6 +12,7 @@
 #include <unistd.h>
 #include <ctype.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <signal.h>
 #include <sys/ioctl.h>