You may receive the above error in the mkmf.log file when attempting to install the MySQL gem. A sample of the log file errors is below.
How to Resolve:Install mysql-devel via yum using the following command.
[root@server ~]#yum install mysql-develTags: CentOS, error, gem, mkmf.log, mysql, mysql-devel, mysql.h, Ruby, rubygems, x86_64









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