nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:166:7:E: reference to ent
ity "ISOnum" for which no system identifier could be generated
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:164:0: entity was defined
 here
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:172:40:W: cannot generate
 system identifier for public text "ISO 8879:1986//ENTITIES Publishing//EN"
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:173:7:E: reference to ent
ity "ISOpub" for which no system identifier could be generated
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:171:0: entity was defined
 here
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:179:47:W: cannot generate
 system identifier for public text "ISO 8879:1986//ENTITIES General Technical//E
N"
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:180:8:E: reference to ent
ity "ISOtech" for which no system identifier could be generated
nsgmls:/usr/share/sgml/docbook/sgml-dtd-3.1/dbcent.mod:178:0: entity was defined
 here
make[2]: *** [jw.1] Error 127
make[2]: Leaving directory `/home/jp/sgml/docbook-utils-0.6.14/doc/man'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/jp/sgml/docbook-utils-0.6.14/doc'
make: *** [all-recursive] Error 1