Unable to build java/jdk12 on 5.2-RELEASE?

On a 5.2-REL machine, I seem to be unable to build jdk12. The
newly-compiled javac segfaults at once:

gmake[4]: `../../classes/sun/tools/javac/resources/javac_ja.properties' is up to date.
>>>Recursively making .recompile _at_ Thu Feb 26 15:11:26 GMT 2004 ...
gmake[5]: Entering directory `/usr/ports/java/jdk12/work/build/bsd/sun/javac/recompile'
if [ -s .classes.list ] ; \
then ../../../bin/javac LOTSOFFILES.java
...
fi
Segmentation fault (core dumped)
gmake[5]: *** [.compile.classlist] Error 139
gmake[5]: Leaving directory `/usr/ports/java/jdk12/work/build/bsd/sun/javac/recompile'

Did anyone succeed in building that port recently?

Thomas.

-- 
    Thomas.Quinot_at_Cuivre.FR.EU.ORG