how to use GTK+ on Mingw&msys? what i need to begin with GTK+?

[i VS 미솔리 <ivsp msn com>]

now i'm starting programming with GTK+ in order to support multi 
platform(like Unix, Linux, Windows, MacOS) about which run the my 
appllications.
but i get to be difficult from first step. 
that looks a base.

i would build and install GTK+ API packages(from sources) on Mingw 
including msys under Windows xp.
why? because of   i think my GTK+ applications have to be compiled and 
build, 
after doing which they  have to be run at anywhere(that is, linux version 
do on linux, , windows version do on windows..) - i can know how to 
cross-compile for each different platfrom from Mingw wegsite.


i done as following 
"http://developer.gnome.org/doc/API/2.0/gtk/gtk-building.html";.
so i done following on command prompt of msys :
1. unzip GTK+ 2.8.9 source package 'gtk+-2.8.9.tar.gz' at /sdk/gtk 
directory i made
2. i move my path to gtk+-2.8.9 source topleve folder '/sdk/gtk/gtk+-2.8.9' 
which be made by above unzipping.
3../configure
this looks working some of many  processing.
4.make
 this display a message as "*** No targets specified and no makefie found. 
Stop."
so i done as 'make -f Makefile.in', this case make display as "*** missing 
separator. Stop"
the missing separator of Makefile.in is @SET_MAKE@ at source line 15 

i can don't more.
please tell me what i need to begin with GTK+?
and how to do for which load GTK+ API architecture on Mingw&msys (not GTK+ 
for Win32 package, i know it purpose) ?

thanks.