Hello everybody. As a newbie of Linux, I'm avid for your help. Thanks a lot!
I have GTK+2.10.7 installed on my Red Hat 9, and I compiled an example from GTK+ turtorial. But when I try to run it, following error message shows:
hello: error while loading shared libraries: libpangocairo-1.0.so.0: cannot open shared object file: No such file or directory

I can find libpangocairo-1.0.so.0 at /usr/local/lib, but I have no idea why it can not be loaded when running the "hello" program. Any clue?

Below is my installation infromation:

pkg-config --list-all
gmodule-export-2.0 GModule - Dynamic module loader for GLib
cairo cairo - Multi-platform 2D graphics library
gdk-pixbuf-xlib-2.0 GdkPixbuf Xlib - GdkPixbuf rendering for Xlib
cairo-svg cairo-svg - SVG backend for cairo graphics library
cairo-xlib-xrender cairo-xlib_xrender - Xlib Xrender backend for cairo graphics library
pangocairo Pango Cairo - Cairo rendering support for Pango
gdk-x11-2.0 GDK - GIMP Drawing Kit (x11 target)
freetype2 FreeType 2 - A free, high-quality, and portable font engine.
fontconfig Fontconfig - Font configuration and customization library
gmodule-2.0 GModule - Dynamic module loader for GLib
cairo-pdf cairo-pdf - PDF backend for cairo graphics library
gdk-pixbuf-2.0 GdkPixbuf - Image loading and scaling
gtk+-x11-2.0 GTK+ - GIMP Tool Kit (x11 target)
cairo-xlib cairo-xlib - Xlib backend for cairo graphics library
glib-2.0 GLib - C Utility Library
gobject-2.0 GObject - GLib Type, Object, Parameter and Signal Library
gthread-2.0 GThread - Thread support for GLib
libpng libpng12 - Loads and saves PNG files
pangoft2 Pango FT2 - Freetype 2.0 font support for Pango
gtk+-2.0 GTK+ - GIMP Tool Kit (x11 target)
gmodule-no-export-2.0 GModule - Dynamic module loader for GLib
libpng12 libpng12 - Loads and saves PNG files
cairo-png cairo-png - PNG backend for cairo graphics library
pangox Pango X - X Window System font support for Pango
cairo-ft cairo-ft - FreeType font backend for cairo graphics library
cairo-ps cairo-ps - PostScript backend for cairo graphics library
pango Pango - Internationalized text handling
gtk+-unix-print-2.0 GTK+ - GIMP Tool Kit Unix print support
gdk-2.0 GDK - GIMP Drawing Kit (x11 target)
atk Atk - Accessibility Toolkit

env
SSH_AGENT_PID=2094
HOSTNAME=SW00206PC1Linux
PVM_RSH=/usr/bin/rsh
DESKTOP_STARTUP_ID=
TERM=xterm
SHELL=/bin/bash
HISTSIZE=1000
GTK_RC_FILES=/etc/gtk/gtkrc:/root/.gtkrc-1.2-gnome2
WINDOWID=29360387
OLDPWD=/
QTDIR=/usr/lib/qt-3.1
USER=root
LD_LIBRARY_PATH=\usr\local\lib
LS_COLORS=no=00:fi=00:di=00;34:ln=00;36i=40;33:so=00;35:bd=40;33;01:cd=40;33;01r=01;05;37;41:mi= 01;05;37;41:ex=00;32:*.cmd=00;32:*.exe=00;32:*.com=00;32:*.btm=00;32:*.bat=00;32:*.sh=00;32:*.csh=00 ;32:*.tar=00;31:*.tgz=00;31:*.arj=00;31:*.taz=00;31:*.lzh=00;31:*.zip=00;31:*.z=00;31:*.Z=00;31:*.gz =00;31:*.bz2=00;31:*.bz=00;31:*.tz=00;31:*.rpm=00;31:*.cpio=00;31:*.jpg=00;35:*.gif=00;35:*.bmp=00;3 5:*.xbm=00;35:*.xpm=00;35:*.png=00;35:*.tif=00;35:
PVM_ROOT=/usr/share/pvm3
SSH_AUTH_SOCK=/tmp/ssh-XXkJAgQl/agent.2079
SESSION_MANAGER=local/SW00206PC1Linux:/tmp/.ICE-unix/2079
USERNAME=root
MAIL=/var/spool/mail/root
PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
INPUTRC=/etc/inputrc
PWD=/mnt/hgfs/sandbox
XMODIFIERS=@im=none
LANG=en_US.UTF-8
LAMHELPFILE=/etc/lam/lam-helpfile
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
SHLVL=3
HOME=/root
XPVM_ROOT=/usr/share/pvm3/xpvm
GNOME_DESKTOP_SESSION_ID=Default
BASH_ENV=/root/.bashrc
LOGNAME=root
LESSOPEN=|/usr/bin/lesspipe.sh %s
DISPLAY=:0.0
G_BROKEN_FILENAMES=1
COLORTERM=gnome-terminal
XAUTHORITY=/root/.Xauthority
_=/bin/env

IIRC, Redhat doesn't have /usr/local/lib in it's ld.so.conf. try adding to /etc/ld.so.conf, then run ldconfig and try again.

Thhhhhhhhhhanks! It works! The problem really balks me.