Vnc-server not installed on CentOS 6.4

You seem to be trying to install packages from the remi repository (and remi-test for PHP 5.4) but the repository isn't enabled or not present on your system.

If you haven't already installed the remi repository, do that now by installing the appropriate remi-release package.

Then you need to edit /etc/yum.repos.d/remi.repo and change enabled=0 to enabled=1 for the repositories you wish to use. For PHP 5.4 on EL 6, you must enable both remi and remi-test.

You also need to have the EPEL repository installed in order to use remi, though it seems you already have that one.

Your question makes no sense, I'm afraid. You've built python from source, and installed it in an alternate location (/usr/local/bin, if the linked article is right). Once you build from source, you've departed completely from the foo, foo-devel convention of package management. Or, in short, there is no python-devel for a built-from-source install.

But you will have installed the necessary libraries as part of that build; they're probably in /usr/local/lib. In order to use these, it will be necessary to direct each new piece of software that you want to compile, to find the new python libraries in preference to the standard system ones. Sometimes, putting /usr/local/bin first in your path, so that running python picks up the new version, will be enough; sometimes, there will be an environment variable that directs the build to look in a certain location (eg, export PYTHON_LIBDIR=/usr/local/lib; sometimes, there will be a configure flag (eg ./configure --python-libs=/usr/local/lib). It will vary from build to build, and you will have to experiment with each build.

If you are thinking that this is painful, you are right; there is a reason why software packaging systems became very popular over the last 20 years; by building a major system component by hand from source you've just stepped back to the early '90s - good luck!