SPU compile problem

   I write a SPU called warpvertexspu to warp the image by a Cg program. In 
the warpvertexspu.h,
I  include the cg.h and cgGL.h and in warpvertexspu_init.c and 
warpvertexspu.c I call cg and cgGL functions. But after I compile the source 
by adding -lCgGL and -lCg to the LDFLAGS variable in the makefile, when I 
use the warpvertexspu.so , It says "DLL could find/open the 
warpvertexspu.so". But if I comment the cg and cgGL functions in the 
warpvertexspu.c and keep the cg functions in the warpvertexspu_init.c, after 
compile the SPU can work well.
the warpvertexspu.c:

#include <stdio.h>
#include "cr_spu.h"
#include "warpvertexspu.h"


static void WARPVERTEXSPU_APIENTRY warpvertexBegin(GLenum mode)
{
    if(WarpParam!=NULL)
          cgGLSetMatrixParameterfc(WarpParam,WarpM);
     if(ModelViewProjParam!=NULL)
         cgGLSetStateMatrixParameter(ModelViewProjParam,
                               CG_GL_MODELVIEW_PROJECTION_MATRIX,
                               CG_GL_MATRIX_IDENTITY);
     cgGLEnableProfile(profile);
     warpvertex_spu.super.Begin(mode);
}

static void WARPVERTEXSPU_APIENTRY warpvertexEnd(void)
{
     warpvertex_spu.super.End();
     cgGLDisableProfile(profile);
}
SPUNamedFunctionTable _cr_warpvertex_table[] = {
       { "Begin",   (SPUGenericFunction)warpvertexBegin },
       { "End",     (SPUGenericFunction)warpvertexEnd   },
       { NULL, NULL }
};

I don't know why  calling cg functions in the warpvertexspu_int.c can work 
well but calling in the warpvertexspu.c cannot work. Maybe there is 
something wrong with the makefile.could you give me some help?
Thanks very much!

Sincerely yours
    Yang Tingjun

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