Old ia32-libs contains this lib,
Debian sid: $ dpkg -L ia32-libs | grep -i xtst /usr/lib32/libXtst.so.6.1.0 /usr/lib32/libXtst.so.6
and you can build sun-java6 amd64 with pbuilder
Now in Ubuntu 12.04 with multiarch-support you can't add "libxtst6:i386" to Depends and sun-java6 fails to build because of not found libXtst.so.6
Old ia32-libs contains this lib,
Debian sid: libXtst. so.6.1. 0 libXtst. so.6
$ dpkg -L ia32-libs | grep -i xtst
/usr/lib32/
/usr/lib32/
and you can build sun-java6 amd64 with pbuilder
Now in Ubuntu 12.04 with multiarch-support you can't add "libxtst6:i386" to Depends and sun-java6 fails to build because of not found libXtst.so.6