I encountered a bug updating Glibc

[Florian Weimer]

* CGCL_何卓 via Libc-alpha:

> Hello,I updated from glibc2.17 to glibc2.28 on centos6

CentOS 6 comes with Linux 2.6.32, which does not satisfy the minimum
Linux version requirement of glibc 2.28, which is Linux 3.2.

Thanks,
Florian
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