error: Failed dependencies:
glibc-common = 2.5-34 is needed by (installed) glibc-2.5-34.i686
I really need to install the following package:
glibc-common-2.9-3.i386

Which version of Fedora are you using. You may be so far behind the 8 ball it is time to install a newer version. Glibc is the C library that everything uses. Going from 2.5 to 2.9 you are probably using a non-supported version of the distro.

bala_adi seeing as this is in the Red Hat section and your glibc is 2.5-34
Are you running rehl 4 . If so you can NOT install the glibc-common-2.9-3.i386.rpm it WILL KILL the rhel 4 OS

two thinge
1) install RHEL 5.3 ( CentOS 5.3)
2) build the new glib from source BUT DO NOT INSTALL IT IN THE SYSTEM PATH
install it to some place like
/usr/local/Glib-2.9-3

then build from source the program that needs it and point " ./configure" or the "Makefile" to
-I/usr/local/Glib-2.9-3/include
-L/usr/local/Glib-2.9-3/lib
and point package config to the /usr/local/Glib-2.9-3/lib/pkgconfig

and a bunch of other things too will need to know where "/usr/local/Glib-2.9-3" is
BUT NOT THE OPERATING SYSTEM if rhel4 starts to use the new glib it WILL BREAK THINGS

First i would like to thank you for your answers.
Secondly i use Red Hat Enterprise Linux 5.3
2.6.18-128.el5

well you will have to build glibc 2.9-3 from the source . What needs it ?

I tried to build it from source but at this moment is quite difficult for me so I let someone i know to help me. Thanks for your replies.