Cannot install gedit-plugins-2.16.0 on RHEL 5.7 (Tikanga)

I am trying to compile the gedit plugins with gedit 2.16.0 and RHEL 5.7 (arch: i386). I downloaded the package and followed the instruction in README:

The error output:

checking for GEDIT... configure: error: Package requirements (
glib-2.0 >= 2.8.0
gtk+-2.0 >= 2.8.0
gtksourceview-1.0 >= 1.2.0
gedit-2.16 >= 2.16.0
libglade-2.0 >= 2.4.0
gnome-vfs-2.0 >= 2.13.4
) were not met:

No package 'gtk+-2.0' found
No package 'gtksourceview-1.0' found
No package 'gedit-2.16' found
No package 'libglade-2.0' found
No package 'gnome-vfs-2.0' found

Please help!!

I understand that this thread is exactly the same on the internet but I don't see any solution in that thread about how to install these packages. Please help me with the procedure to install the above packages. I couldn't find the right ones.

What package did you download?