Following step by step the article Oracle Database 11g Release 2 (11.2) Installation On Oracle Linux 6, the setup show message like these:
Package: libaio-0.3.105 not found
Package: compat-libstdc++-126.96.36.199 not found
During the Linux installation I have used (as suggested) oracle-rdbms-server-11gR2-preinstall.
Can ignore the warnings ?