how to update the gtk lib??

hi,

Because the previous version of glib and gtk in my system is 1.2,i want to 
use

the new function of gtk2.0.So i try to update the lib,but no success.Here's 
my 

process:

Fisrt,compile and install the glib2.0.0 and gtk2.0.0

Second,add path in the ld.so.config and run ldconfig,and i see these 
information:

/opt/gtk/lib:
	libgdk_pixbuf_xlib-2.0.so.0 -> libgdk_pixbuf_xlib-2.0.so.0.0.0
	libgtk-x11-2.0.so.0 -> libgtk-x11-2.0.so.0.0.0
	libgdk-x11-2.0.so.0 -> libgdk-x11-2.0.so.0.0.0
	libgdk_pixbuf-2.0.so.0 -> libgdk_pixbuf-2.0.so.0.0.0
/opt/glib/lib:
	libgthread-2.0.so.0 -> libgthread-2.0.so.0.0.0
	libgmodule-2.0.so.0 -> libgmodule-2.0.so.0.0.0
	libgobject-2.0.so.0 -> libgobject-2.0.so.0.0.0
	libglib-2.0.so.0 -> libglib-2.0.so.0.0.0

but the glib-config and gtk-config shell in the /usr/bin/ is still for

glib1.2 and gtk1.2,at every time the configure of my code will use the 

two config shell to identify the library.I try to modify them for 2.0,

but have no effect,and it had cause the 1.2 version lost.

What a mess it is,how can i use the new lib in my system?How to remove the 
old 

version?How to modify the two config file for gtk2.0?


thanks in advance

Best regards

david

ps.
checking for gtk-config... /usr/bin/gtk-config
checking for GTK - version >= 1.2.0... no
*** Could not run GTK test program, checking why...
*** The test program failed to compile or link. See the file config.log
for the
*** exact error that occured. This usually means GTK was incorrectly
installed
*** or that you have moved GTK since it was installed. In the latter
case,
you
*** may want to edit the gtk-config script: /usr/bin/gtk-config
configure: error: GTK not installed







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