//If you want to install the 32-bit version of libjpeg
1. Query the specific 32-bit version and install it
yum
search libjpeg.i686
yum -y install libjpeg.i386
2. A once and for all method, doing so will install both the 32 and 64 bit versions.
echo 'multilib_policy=all' >> /etc/yum.conf