Easy Install requires a working build environment. This is installed by default on nearly all modern Linux distributions. Please make sure you have selected the “development tools” packages when you install or update your operating system. This can be installed with the following commands (as root):

yum groupinstall "Development Tools"

The following additional packages are also recommended:

yum install gettext
yum install shared-mime-info 
yum install openssl-devel

If you want to use system icons such as the GNOME File Icons in WebCit, install

yum install gnome-icon-theme

and after installation do

cd /usr/local/webcit/static
ln -s /usr/share/icons/gnome/24x24/mimetypes icons

You can also use every other Freedesktop.org compliant Icon theme.