While installing WebCenter Suite 11g, during prerequisites check, three Linux libraries were missing in my case:
As George mentions, you can use yum or apt-get to install those libraries, however you will need to have subscription to Linux support then. I'm not using support subscription for Oracle Enterprise Linux, so I did libraries update manually.
First, I downloaded missing libraries from RPM Search site. Just type there library name you are looking for, and you are ready to download. After you will get required libraries, switch to super user mode with su command in Linux shell and type rpm -ihv libraryname to install it.
When required libraries will be installed, WebCenter Suite 11g installation prerequisites check will pass without warnings.