To install j2sdk, you need to download the following files into your source directory: From the download location (registration required) j2sdk-&cj2sdk-version;-src-scsl.zip j2sdk-&cj2sdk-version;-motif-linux-i386.zip j2sdk-&cj2sdk-version;-mozilla_headers-unix.zip From j2sdk-gcc31.patch You should be in the java directory under your source directory. Verifiy that environment is set as described in the configuration section of the binary installation. If not: export JAVA_HOME=$PWD/j2sdk&j2sdk-version; export PATH=$PATH:$JAVA_HOME/bin Unzip and set the install of j2sdk by running the following commands: for i in ../j2sdk-1_4_0-*.zip; do unzip $i; done && patch -Np1 -i ../j2sdk-gcc31.patch && export SRC=$PWD && export ALT_BOOTDIR="$JAVA_HOME" && export ALT_MOTIF_DIR=$SRC && export ALT_MOZILLA_PATH=$SRC && export ALT_DEVTOOLS_PATH="/usr/bin" && export MILESTONE="blfscompiled" && export BUILD_NUMBER=`date +%s` && export DEV_ONLY=true && export OTHER_LDFLAGS="-lpthread" && unset JAVA_HOME && unset CLASSPATH && export OTHER_CFLAGS=${CFLAGS} && export OTHER_CXXFLAGS=${CXXFLAGS} && unset CFLAGS && unset CXXFLAGS Make and Install j2sdk with the following commands: cd $SRC/control/make && make && cd $SRC/control/build/linux-i386 && mkdir -p /opt/java && cp -a j2sdk-image /opt/java/j2sdk-&cj2sdk-version; && cd /opt/java && ln -s j2sdk-&cj2sdk-version; j2sdk Test the installation with the following commands: export JAVA_HOME=/opt/java/j2sdk && $JAVA_HOME/jre/bin/java -version If you get a version line, a description of the runtime environment and a desrciption of the client VM (virtual machine), you are ready to go.