Failed Dependency

[Zain Cassimjee]

I have an installation of Redhat 6.0, I am
attempting to install wine from an RPM file,
bit it gives me the following message :

Failed Dependency :
                                libGL.so.1

1. What does this mean?
2. Where do I get libGL.so.1 from (That will work with Redhat 6.0)?