I am in the process of installing GTK+ but it needs various pre-requisites. These are

glib - 2.0 >= 2.35.3
atk - >= 2.7.5
Pango- >= 1.32.4
gdk-pixbuf-2.0 >= 2.27.1
Now I upgraded my glib-2.0 to 2.38.2, and I've tried upgrading atk, pango and gdk-pixbuf

checking for GLIB - version >= 2.31.2... 
'pkg-config --modversion glib-2.0' returned 2.38.2, but GLIB (2.32.4)
was found! If pkg-config was correct, then it is best
to remove the old version of GLib. You may also be able to fix the error
by modifying your LD_LIBRARY_PATH enviroment variable, or by editing
/etc/ld.so.conf. Make sure you have run ldconfig if that is
required on your system.
If pkg-config was wrong, set the environment variable PKG_CONFIG_PATH
to point to the correct configuration files

configure: error: 
GLIB 2.31.2 or better is required. The latest version of
GLIB is always available from ftp://ftp.gtk.org/. If GLIB is installed
but not in the same location as pkg-config add the location of the file
glib-2.0.pc to the environment variable PKG_CONFIG_PATH.