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-devel

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Installing the rpmforge yum repository on CentOS 5 is really easy. Follow the simple steps below and the rpmforge repo will be installed in seconds.

1. Verify 32 Bit or 64 Bit: Verify if your server is 32 bit or 64 bit. Use this Question-Defense.com article to verify if your system is 32-bit or 64-bit.

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To verify if a system is 32 bit versus 64 bit you can use the uname command. Below are examples of using the uname command from the CLI on a 32 bit system followed by using the uname command on a 64 bit system.

32 Bit CentOS Linux Server

[root@server ~]# uname -a
Linux server1.example.com 2.6.18-92.1.13.el5 #1 SMP Wed Sep 24 19:33:52 EDT 2008 i686 i686 i386 GNU/Linux

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You may see an error like the below when attempting to see if a certain package is installed using the yum package manager. Yum is the default package manager on RedHat Linux and CentOS Linux. Using the “yum list *SOMETEXT*” command will list all packages that contain “sometext” or you could use “yum list sometext” which will list a package specifically called “sometext”. Below you can see an attempt to list the “git” package on a CentOS server however an error was returned.

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To install the latest git on CentOS 5 you will need to install from source since the yum repos are typically fairly far behind. Follow the instructions below and installing git will be a snap.

1. Install Dependencies: First we need to install a couple packages via yum to cover the dependencies for building git from source.

[root@server ~]#yum install curl-devel
[root@server ~]#yum install expat-devel
[root@server ~]#yum install gettext-devel
[root@server ~]#yum install openssl-devel
[root@server ~]#yum install zlib-devel

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