Issue

What problem/issue/behavior are you having trouble with? What do you expect to see?
gcc failed to install

Where are you experiencing the behavior? What environment?
yum install gcc should work without any error

yum install gcc

...
Resolving Dependencies
--> Running transaction check
---> Package gcc.x86_64 0:4.8.5-36.el7_6.2 will be installed
--> Processing Dependency: libgomp = 4.8.5-36.el7_6.2 for package: gcc-4.8.5-36.el7_6.2.x86_64
--> Processing Dependency: cpp = 4.8.5-36.el7_6.2 for package: gcc-4.8.5-36.el7_6.2.x86_64
--> Processing Dependency: glibc-devel >= 2.2.90-12 for package: gcc-4.8.5-36.el7_6.2.x86_64
--> Processing Dependency: libmpfr.so.4()(64bit) for package: gcc-4.8.5-36.el7_6.2.x86_64
--> Processing Dependency: libmpc.so.3()(64bit) for package: gcc-4.8.5-36.el7_6.2.x86_64
--> Running transaction check
---> Package cpp.x86_64 0:4.8.5-36.el7_6.2 will be installed
---> Package glibc-devel.x86_64 0:2.17-260.el7_6.6 will be installed
--> Processing Dependency: glibc-headers = 2.17-260.el7_6.6 for package: glibc-devel-2.17-260.el7_6.6.x86_64
--> Processing Dependency: glibc = 2.17-260.el7_6.6 for package: glibc-devel-2.17-260.el7_6.6.x86_64
--> Processing Dependency: glibc-headers for package: glibc-devel-2.17-260.el7_6.6.x86_64
---> Package libgomp.i686 0:4.8.5-36.el7_6.2 will be installed
---> Package libmpc.x86_64 0:1.0.1-3.el7 will be installed
---> Package mpfr.x86_64 0:3.1.1-4.el7 will be installed
--> Running transaction check
---> Package glibc-devel.x86_64 0:2.17-260.el7_6.6 will be installed
--> Processing Dependency: glibc = 2.17-260.el7_6.6 for package: glibc-devel-2.17-260.el7_6.6.x86_64
---> Package glibc-headers.x86_64 0:2.17-260.el7_6.6 will be installed
--> Processing Dependency: glibc = 2.17-260.el7_6.6 for package: glibc-headers-2.17-260.el7_6.6.x86_64
--> Processing Dependency: kernel-headers >= 2.2.1 for package: glibc-headers-2.17-260.el7_6.6.x86_64
--> Processing Dependency: kernel-headers for package: glibc-headers-2.17-260.el7_6.6.x86_64
--> Running transaction check
---> Package glibc-devel.x86_64 0:2.17-260.el7_6.6 will be installed
--> Processing Dependency: glibc = 2.17-260.el7_6.6 for package: glibc-devel-2.17-260.el7_6.6.x86_64
---> Package glibc-headers.x86_64 0:2.17-260.el7_6.6 will be installed
--> Processing Dependency: glibc = 2.17-260.el7_6.6 for package: glibc-headers-2.17-260.el7_6.6.x86_64
---> Package kernel-headers.x86_64 0:3.10.0-957.21.3.el7 will be installed
--> Finished Dependency Resolution
Error: Package: glibc-devel-2.17-260.el7_6.6.x86_64 (rhel-7-server-rpms)
Requires: glibc = 2.17-260.el7_6.6
Installed: glibc-2.17-292.el7.i686 (@rhel-7-server-rpms)
glibc = 2.17-292.el7
Available: glibc-2.17-55.el7.i686 (rhel-7-server-rpms)
glibc = 2.17-55.el7
...