Real little but useful tip for CentOs 6.7

Error: Package: systemtap-devel-2.7-2.el6.x86_64 (base)
           Requires: kernel-devel

How to solve ??
Your system is probably configured to exclude the kernel packages. In /etc/yum.repos.d check all files and comment out all the lines that start with exclude=
#exclude=kernel*

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