--- gawk-3.1.8.old/awk.h
+++ gawk-3.1.8/awk.h
@@ -52,6 +52,7 @@
 #endif /* HAVE_LIMITS_H */
 #include <ctype.h>
 #include <setjmp.h>
+#include <sys/param.h>
 
 #include "gettext.h"
 #define _(msgid)  gettext(msgid)