i try to install oracle 12c on red hat linux el5.5 64bit every thing i done perfectly, but el5.5 have the rpm glibc-2.5-49* but oracle 12c needs rpm glibc-2.5-58*(x86-64) how to do that,i'm not familiar with linux help me to solve this..

first RHEL 5.5 is a few years out of date
the current in the OLD legacy hardware/software Operating system id RHEL 5.11

if you are not using 10+year old hardware or NEED to run 10+year old code
i would NOT use rhel5

instead use the Current RHEL 7.1
and BUY it
yes you HAVE !!! TO BUY THE REQUIRED SUPPORT CONTRACT
a standard 1 year single server license is $799 per year

or

install the FREE rebuild of the rhel code
CentOS
now cent ONLY supports the current minor versions
CentOS 5.11
CentOS 6.6 ( 6.7 soon)
CentOS 7.0 ( 7.1 soon)


as to glibc
it is already installed

will return nothing to do , already installed

# yum install glibc

... will update to the latest `glibc' : glibc-2.5-123.el5_11.1