postgresql HEAD build failure

I have, for some months, been running this daily, but not taking notice
of the results:
[pgtest@numbat ~]$ cat bin/pg_build
#!/bin/bash
set -xe
cd /home/pgtest/pgsql/pgsql-2007-04-23/
ping -c4 2>/dev/null anoncvs.postgresql.org | grep -q 'bytes from'\
&& {
make distclean || :
cvs -q update
./configure --prefix=${HOME}//postgres --with-pgport=5433 --with
-pam --with-openssl \
--enable-depend \
--with-gnu-ld --with-python --with-perl
}
time make -j3 -s && time make -j3 -s install
[pgtest@numbat ~]$

It fails thus:
config.status: linking ./src/makefiles/Makefile.linux to src/Makefile.port
+ make -j3 -s
tsearchcmds.c:38:30: error: tsearch/ts_cache.h: No such file or directory
tsearchcmds.c:39:31: error: tsearch/ts_public.h: No such file or directory
tsearchcmds.c:40:30: error: tsearch/ts_utils.h: No such file or directory
tsearchcmds.c: In function ‘getTokenTypes’:
tsearchcmds.c:1676: error: ‘TSParserCacheEntry’ undeclared (first use in
this function)
tsearchcmds.c:1676: error: (Each undeclared identifier is reported only once
tsearchcmds.c:1676: error: for each function it appears in.)
tsearchcmds.c:1676: error: ‘prs’ undeclared (first use in this function)
tsearchcmds.c:1676: warning: implicit declaration of function
‘lookup_ts_parser_cache’
tsearchcmds.c:1677: error: ‘LexDescr’ undeclared (first use in this
function)
tsearchcmds.c:1677: error: ‘list’ undeclared (first use in this function)
tsearchcmds.c:1678: warning: ISO C90 forbids mixed declarations and code
tsearchcmds.c:1693: error: expected expression before ‘)’ token
tsearchcmds.c: In function ‘serialize_deflist’:
tsearchcmds.c:2002: warning: implicit declaration of function
‘CStringGetTextP’
tsearchcmds.c:2002: warning: assignment makes pointer from integer
without a cast
tsearchcmds.c: In function ‘deserialize_deflist’:
tsearchcmds.c:2098: warning: implicit declaration of function
‘TextPGetCString’
tsearchcmds.c:2098: warning: format ‘%s’ expects type ‘char *’, but
argument 2 has type ‘int’
tsearchcmds.c:2209: warning: format ‘%s’ expects type ‘char *’, but
argument 2 has type ‘int’
make[3]: *** [tsearchcmds.o] Error 1
make[2]: *** [commands-recursive] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [all] Error 2
make: *** [all] Error 2

My most recent successful build:
-rwxr-xr-x 1 pgtest 1008 39322 Jun 18 07:52 postgres/bin/createdb
-rwxr-xr-x 1 pgtest 1008 39233 Jun 18 07:52 postgres/bin/clusterdb


This would be about when I switched my desktop to:
[pgtest@numbat ~]$ rpm -qif /etc/redhat-release
Name : sl-release Relocations: (not relocatable)
Version : 5.0 Vendor: Scientific Linux
Release : 4 Build Date: Sat 21 Apr 2007 12:37:20 AM WST
Install Date: Fri 15 Jun 2007 10:37:03 AM WST Build Host: norob.fnal.gov
Group : System Environment/Base Source RPM: sl-release-5.0-4.src.rpm
Size : 57652 License: GPL
Signature : DSA/SHA1, Sat 21 Apr 2007 12:37:32 AM WST, Key ID
da6ad00882fd17b2
Summary : Scientific Linux release file
Description :
Scientific Linux release files
[pgtest@numbat ~]$

SL5 is a clone (like CentOS) of RHEL5.

My guess is that this version of gcc implements new rules:
[pgtest@numbat ~]$ gcc --version
gcc (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[pgtest@numbat ~]$

Please don't reply off-list.

Should I report this as a bug?
-- 

Cheers
John Summerfield