Build error on current_at_r296308: 'yacc.h' file not found

Hi!

Today, I upgraded to r296308 and had this failure during buildworld:

===> usr.bin/mkesdb_static (obj,build-tools)
cc -O2 -pipe -I/usr/src/usr.bin/mkesdb_static -I/usr/src/usr.bin/mkesdb_static/../mkesdb  -I/usr/src/usr.bin/mkesdb_static/../../lib/libc/iconv  -g -std=gnu99  -Qunused-arguments -I/usr/obj/usr/src/tmp/legacy/usr/include -c lex.c -o lex.o
/usr/src/usr.bin/mkesdb_static/../mkesdb/lex.l:44:10: fatal error: 'yacc.h' file not found
#include "yacc.h"
1 error generated.
*** Error code 1

A 'script' output is available at http://people.freebsd.org/~pi/logs/src-up-2

Is it just me or ... ?

-- 
pi_at_opsec.eu            +49 171 3101372                         4 years to go !