[GtkGLExt] Problems getting gtkglext to work under Cygwin

["Douglas A. Vechinski" <douglas vechinski dynetics com>]

I have an application that uses OpenGL, GTK+, and  GtkGLext that 
currently compiles and runs under Linux.  Several of my co-workers would 
like to use it under Windows. I am  now attempting to get a version that 
runs under Windows.  I would like to use the Cygwin environment to 
create/compile the Windows executable.  I want it to use the Windows 
API, that is I don't want to require the Cygwin Xserver.  Also, if 
possible I would like it to not depend upon the cygwin1.dll.

It's been a while since I have used Cygwin much.  So I just installed 
the latest packages.  I didn't find and GTK+ packages at the standard 
mirros sites but found  atk, glib, pango, and gtk+ packages at 
http://web.sfc.keio.ac.jp/~s01397ms/cygwin and installed those.

I have been able to compile and run the standard OpenGL Redbook 
examples.  Also, I have been able to compile and run some of the 
gtk-tutorial examples using `pkg-config --cflags --libs gtk+-win32-2.0` 
on the compile line (also without the win32 under the Xserver) (although 
if I compile with -mno-cygwin and run the executable I get a runtime error).

Next, I tried compiling GtkGLext under Cygwin.  I just did a ./configure 
followed by a make and a make install.  (I had 2 slight problems during 
the make.  I'll elaborate more if requested but I don't think they are 
related to my current problem).  However, I did have several warnings 
that may be related as shown below:

*** Warning: linker path does not have real file for library -lglu32.
*** I have the capability to make that library automatically link in when
*** you link to this library.  But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because I did check the linker path looking for a file starting
*** with libglu32 and none of the candidates passed a file format test
*** using a file magic. Last file checked: /lib/w32api/libglu32.a

*** Warning: This system can not link to static lib archive 
../gdk/libgdkglext-w
in32-1.0.la.
*** I have the capability to make that library automatically link in when
*** you link to this library.  But I can only do this if you have a
*** shared version of the library, which you do not appear to have.
libtool: link: warning: `/lib/libpangox-1.0.la' seems to be moved

I received several of the warnings for -lglu32 -lopengl32 -lgdi32 
-luser32 -lkernel32 -lX11 but don't know if they are significant.

Ok, finally, I then attempted to compile the simple.c example in 
GtkGLext.  (I added /usr/local/lib/pkgconfig to PKG_CONFIG_PATH).  I 
tried compiling with "gcc -o simple simple.c `pkgconfig --cflags --libs 
gtkglext-win32-1.0`"  I receive several  undefined references errors for
_glFinish, _glDrawBuffer, _glReadBuffer etc, from 
/usr/local/lib/libgdkglext-win32-1.0.a

I have also tried downloading the gtkglext-win32-1.0.5.zip file from 
sourceforge which I thought would be a precompiled version that I could 
use under Cygwin.  Unzipped the files in /usr/local.  I then try 
compiling siimple.c.  It compiled with no errors.  However when I tried 
executing it I get an error that it was unable to located 
libgdk-win32-2.0-0.dll.  There is a libgdk-win32-2.0.dll.a under /lib 
but it doesn't seem to work.

Can somebody where I am going wrong and what I need to do?