Problem DocBook 4.2 detecting at configure time

Hi!

I am using FreeBSD 5.4. There are installed:
docbook-4.2         V4.2 of the DocBook DTD, designed for technical
documentati
docbook-sk-4.1.2_3  XML version of the DocBook DTD version controlled
for Scrol
docbook-xml-4.2_1   XML version of the DocBook DTD
docbook-xsl-1.69.1  XSL DocBook stylesheets
dsssl-docbook-modular-1.79,1 DSSSL stylesheets for the DocBook DTD by
Norman Walsh
sdocbook-xml-4.1.2.5_2 "Simplified" DocBook XML DTD

jade-1.2.1_9        An object-oriented SGML/XML parser toolkit and DSSSL
engine
OpenSP-1.5_6        This package is a collection of SGML/XML tools
called OpenSP

When I issue command:
./configure --prefix=/usr/local/pgsql --enable-depend --enable-nls
--enable-integer-datetimes --with-openssl --with-pam
--enable-thread-safety --with-includes=/usr/local/include
--with-libraries=/usr/local/lib --with-perl --with-python --with-tcl
--with-tclconfig=/usr/local/lib/tcl8.4 2>&1 > sci-pgsql.log

I got the following:
....
checking for onsgmls... onsgmls
checking for openjade... no
checking for jade... jade
checking for DocBook V4.2... no
checking for DocBook stylesheets...
/usr/local/share/sgml/docbook/dsssl/modular
checking for collateindex.pl...
/usr/local/share/sgml/docbook/dsssl/modular/bin/collateindex.pl
checking for sgmlspl... no
....
and in file config.log:
....
configure:22300: checking for DocBook V4.2
onsgmls:/usr/local/share/sgml/docbook/4.2:1:0:E: nul character
onsgmls:/usr/local/share/sgml/docbook/4.2:1:0:E: nul character
....
and so on

How it can be fixed?

Best regards,

Oleg Golovanov
Equant LLC