Easy Install requires a working build environment plus some libraries (note that the versions of for example gcc (4.1 here) may differ on your system). search these packages in Yast, and install them. Not all of them are needed, depending on the features you want:

libstdc++41-devel
zlib-devel
glibc-devel
gettext-devel
libstdc++-devel
readline-devel
gcc41-locale
gcc41-obj-c++
libgcc41
gcc41
gcc41-c++
gcc41-objc
gcc-objc
gcc-obj-c++
gcc-locale
gcc
gcc-c++

openssl-devel
ncurses-devel
pam-devel
shared-mime-info

If you want to use for example GNOME File-Icons in Webcit, install gnome-icon-theme using Yast 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.