What is recompile?

Apparently I need to recompile php with something called GNU so I can run my photogallery:

To include GNU gettext support in your PHP build you must add the option --with-gettext[=DIR] where DIR is the gettext install directory, defaults to /usr/local.
I've never done anything like this before. Do I just ssh into the machine and type --with-gettext[=dir] ? Is that all I type? Do I need to install the program first ten type this stuff? Will the server go down when I'm doing this? I tried searching but I can't find anythign to explain the recompile process to a newbie.

I also need something called jhead.
http://www.sentex.net/~mwandel/jhead/index.html

I dowloaded a text file for linux but I don't know what to do with it. Any ideas?

Thanks

 

 

 

 

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