pdftk fails to build on Leopard (PPC) because of lack of gcj-mp-4.2

[shirose@…]

% sudo port install pdftk
---> Fetching pdftk
---> Attempting to fetch pdftk-1.41.tar.bz2 from ​http://www.pdfhacks.com/pdftk/
---> Verifying checksum(s) for pdftk
---> Extracting pdftk
---> Configuring pdftk
---> Building pdftk with target all
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_Users_shirose_src_macports-trunk_dports_textproc_pdftk/work/pdftk-1.41/pdftk" && make all -f Makefile.MacOSX TOOLPATH=/opt/local/bin/ VERSUFF=-mp-4.2 " returned error 2
Command output: make -C ../java_libs
make -C "/opt/local/var/macports/build/_Users_shirose_src_macports-trunk_dports_textproc_pdftk/work/pdftk-1.41/java_libs/gnu_local/java/security";
/opt/local/bin/gcj-mp-4.2 -O2 --encoding=UTF-8 --classpath="/opt/local/var/macports/build/_Users_shirose_src_macports-trunk_dports_textproc_pdftk/work/pdftk-1.41/java_libs" -c Engine.java -o Engine.o
/bin/sh: /opt/local/bin/gcj-mp-4.2: No such file or directory
make[2]: * [Engine.o] Error 127
make[1]: * [libgcj_local] Error 2
make: * [java_libs] Error 2

Error: Status 1 encountered during processing.