This should have been committed in r348511 with the awk update.

It was in my tree, the build worked, but I committed from contrib/one-true-awk
rather than the top level, so was omitted.

usr.bin/awk/Makefile

@@ -25,7 +25,7 @@ ytab.h: awkgram.c awkgram.h .NOMETA
 	ln -sf ${.ALLSRC:M*.h} ${.TARGET}
 
 proctab.c: maketab
-	${BTOOLSPATH:U.}/maketab > proctab.c
+	${BTOOLSPATH:U.}/maketab awkgram.h > proctab.c
 
 build-tools: maketab
 maketab: ytab.h maketab.c ${BUILD_TOOLS_META}