a.1 doc unable to validate

[dave]

Hello,
    I'm reading the fdp guide and have atempted to validate the sample book
in appendix a, specifically section a.1. I'm getting a bunch of files not
found, see below. I'm wondering is there another catalog section i should
reference? I've installed docproj-jadetex and inserted the environment
variables in /etc/profile, is an extra one needed for these examples?
Thanks.
Dave.

$nsgmls -s book.sgml
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:54:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amsa.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:61:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amsb.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:68:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amsc.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:75:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amsn.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:82:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amso.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:89:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-amsr.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:96:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-box.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:103:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-cyr1.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:110:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-cyr2.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:117:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-dia.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:124:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-grk1.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:131:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-grk2.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:138:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-grk3.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:145:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-grk4.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:152:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-lat1.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:159:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-lat2.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:166:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-num.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:173:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-pub.gml" (No such file or directory)
nsgmls:/usr/local/share/sgml/docbook/4.1/dbcent.mod:180:0:E: cannot open
"/usr/local/share/sgml/docbook/4.1/iso-tech.gml" (No such file or directory)