Trying to install boost 1.4.1 without success maybe yum repository is wrong

Hi
I following the tutorial to install boost 1.4.1 in centos 5.6 32 bit
But without success maybe it doesn't find it in my repository in yum , but also when I compile the lib
It doesn't find the libs .

The tutorial link:
Compiling gearman on CentOS 5.6 - gearman | Google Groups

the error im getting when trying to install with yum
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile

  • base: mirror.isoc.org.il
  • extras: mirror.isoc.org.il
  • updates: mirror.isoc.org.il
    Setting up Install Process
    No package boost141* available.

This output here looks like boost141 is not in the repository.

No package boost141* available. 

Try searching for the boost package in your repositories with a shorter string.

yum search boost

If the package isn't in the repository, it will tell you.