I read about some friends post yesterday,you say some lib files may not remove completely,so I am worry about this ,I download the game “quake”,but it need libm.so.5
but mine is libm.so.6
so I want to uninstall my gcc lib,
who know the whole operate? 
Depends on your distribution.What are you running?Generally you want to find what package libm is in download the package with the new version and use it to update the system.I’m assuming you’re running a distro with package support.If you aren’t you should know what to do.
I just know yesterday,I want to uninstall dlibc ,but it can’t,most of the software say they need the libm.so.6 file.So how could I do?
So you need to downgrade.Look for a package with old libraries (there’s one like that in debian).Anyway you don’t need to uninstall libc.Just get libm.so.5(which should be part of older libc packages) and install it or even try making a symlink named libm.so.5 which points to wherever libm.so.6 is pointing.I doubt it needs the older library it just needs to find the specific file.
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