[oracle@12c-5 Disk1]$ ./runInstaller
Starting Oracle Universal Installer...

Checking Temp space: must be greater than 120 MB.   Actual 17080 MB    Passed
Checking swap space: must be greater than 150 MB.   Actual 2047 MB    Passed
Checking monitor: must be configured to display at least 256 colors
    >>> Could not execute auto check for display colors using command
/usr/bin/xdpyinfo. Check if the DISPLAY variable is set.    Failed <<<<
.
Some requirement checks failed. You must fulfill these requirements before
.
continuing with the installation,
.
Continue? (y/n) [n] y
.
.
>>> Ignoring required pre-requisite failures. Continuing...
Preparing to launch Oracle Universal Installer from
/tmp/OraInstall2012-09-06_11-45-44AM. Please wait ...[oracle@12c-5 Disk1]$
Exception in thread "main" java.lang.UnsatisfiedLinkError:
/tmp/OraInstall2012-09-06_11-45-44AM/jdk/jre/lib/amd64/xawt/libmawt.so:
libXi.so.6: cannot open shared object file: No such file or directory
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1703)