We will need to setup target specific flags for the compiler and linkers.

export BUILD32="-mabi=32"
export BUILDN32="-mabi=n32"
export BUILD64="-mabi=64"

You will need to set your host target triplet for o32 bit:

export LFS_TARGET32="`echo ${MACH_TYPE}| sed -e 's/64//g'`"

To prevent errors when you come back to your build, we will export these variables to prevent any build issues in the future:

echo export BUILD32=\""${BUILD32}\"" >> ~/.bash_profile
echo export BUILDN32=\""${BUILDN32}\"" >> ~/.bash_profile
echo export BUILD64=\""${BUILD64}\"" >> ~/.bash_profile
echo export LFS_TARGET32=\""${LFS_TARGET32}\"" >> ~/.bash_profile