Pls. Help me with GTK

[Glenn <glenn email com ph>]

    HI there,  please help me with GTK, I installed the rpms of GTk+ and
GTK-devel 99.-1 and gimp has already
worked ( it was a pre-compiled binary). but whenever I try to compile
something for GTK, it says
" /usr/lib/libgtk.so: undefined reference to `iswctype' "

    I am really sold on the GTK and I want to desperately develop for
it, please do help me. btw here is what I typed, I tried to compile the
hello world example from the GTK tutorial, and I used  "gcc -Wall -g
hello_world.c -o hello_world -L/usr/X11R6/lib -lglib -lgdk -lgtk -lX11
-lXext -lm" .

    maybe as you havenoticed, I am a newbie, so please excuse me if  I
have asked you a really stupid and  common sense question, but please
help me, thanks a lot in advance,


                                                            Thanks again