%general-entities; ]> Setting Host and Target export CLFS_TARGET="x86_64-unknown-linux-gnu" Now set the target triplet for 32 bits: export CLFS_TARGET32="i686-pc-linux-gnu" We will need to setup target-specific flags for the compiler and linker: export BUILD32="-m32" export BUILD64="-m64" Copy settings to Environment Now add the host and target variables, and compiler and linker flags, to ~/.bashrc, just in case you have to exit and restart building later: cat >> ~/.bashrc << EOF export CLFS_HOST="${CLFS_HOST}" export CLFS_TARGET="${CLFS_TARGET}" export CLFS_TARGET32="${CLFS_TARGET32}" export BUILD32="${BUILD32}" export BUILD64="${BUILD64}" EOF