Problem installing jdk13 on FreeBSD 4.8

[Adam]

In file included from ../../oji-plugin/src/motif/common/stubs.c:29:
/usr/X11R6/include/npapi.h:1: #error
"/home/espenr/tmp/qt-3.1-espenr-14496/qt/extensions/nsplugin/src/npapi.h
must be provided by Netscape"
/usr/X11R6/include/npapi.h:2: #error "This file is just a placeholder.
Please see the documentation"
/usr/X11R6/include/npapi.h:3: #error "to learn how to obtain the real
file"
In file included from ../../oji-plugin/src/motif/common/stubs.c:30:
/usr/X11R6/include/npupp.h:1: #error
"/home/espenr/tmp/qt-3.1-espenr-14496/qt/extensions/nsplugin/src/npupp.h
must be provided by Netscape"
/usr/X11R6/include/npupp.h:2: #error "This file is just a placeholder.
Please see the documentation"
/usr/X11R6/include/npupp.h:3: #error "to learn how to obtain the real
file"
gmake[1]: *** [../../tmp/bsd/i386/stubs.o] Error 1
gmake[1]: Leaving directory
`/usr/ports/java/jdk13/work/j2sdk1.3.1/ext/plugin/build/solaris'
gmake: *** [plugin-all] Error 1
*** Error code 2

Stop in /usr/ports/java/jdk13.



I've installed jdk plenty of times on both FreeBSD 4.x and 5.x, and I've
NEVER seen this error before. Can someone explain what this error is
telling me? 'Please see the documentation' isn't very helpful. It
doesn't even tell you where in the documentation to look.

Thanks,
-- 
Adam <blueeskimo at gmx.net>