Calling fortran from R via C does not link -

i have routine in fortran, wish use in r via c implementation. suppose fortran file bivnt.f. now, r cmd shlib c_binary.c , r cmd shlib bivnt.f not give problem when comes linking obtain

> dyn.load("bivnt.so") > dyn.load("c_binary.so") errore in dyn.load("c_binary.so") :    unable load shared object '/users/erlisruli/dropbox/wpapers/abc-cs/rcode/corbindata/c_binary.so':   dlopen(/users/erlisruli/dropbox/wpapers/abc-cs/rcode/corbindata/c_binary.so, 6): symbol not found: _smvbvt_   referenced from: /users/erlisruli/dropbox/wpapers/abc-cs/rcode/corbindata/c_binary.so   expected in: flat namespace  in /users/erlisruli/dropbox/wpapers/abc-cs/rcode/corbindata/c_binary.so 

this seems pretty strange me, since nm obtain

$ nm bivnt.so 0000000000003940 s _a.1868                  u _asin                  u _atan                  u _atan2                  u _exp 0000000000003540 t _mvbvn_ 00000000000027a0 t _mvbvt_ 0000000000002610 t _mvbvtc_ 0000000000002040 t _mvbvtl_ 0000000000002d10 t _mvbvu_ 0000000000001f20 t _mvphi_ 0000000000002b80 t _mvstdt_                  u _sin 00000000000038a0 t _smvbvt_ 0000000000003ba0 s _w.1368 0000000000003aa0 s _x.1369                  u dyld_stub_binder 

any clue?

p.s. c_binary.c is

#include<r.h> /* calcolo ripartizione normale bivariata */ void f77_sub(smvbvt)( double* , int* , double*, double* , int* , double* ) ;  void biv_pmnorm( double *prob , int *nu, double *lower , double *upper , int *flag , double *corr ) {    f77_call(smvbvt)( prob , nu , lower , upper , flag , corr ) ; }  //pairwise log-likelihood-->output: units void bin_pairwise_llik( double *res , double *data , double *cov, double *theta , int *n , int *nc  ) /* n = #righe ; nc = #colonne*/ {     register int k, i, j, ite=0;     int nu=0, flag[2];     double res2=0.0 , res3=0.0, corr=theta[2], lower[2], upper[2];      for( k=0; k<*n; k++ )     {         for( i=0; i<(*nc-1); i++ )         {             for( j=(i+1); j<*nc; j++ )             {                  if(*(data + + k**nc)==1)                   {                      lower[0] = -*(theta+0)-*(theta+1)**(cov + + k**nc);                      upper[0] = 0.0;                      flag[0]  = 1;                  }                  else                  {                      lower[0] = 0.0;                      upper[0] = -*(theta+0)-*(theta+1)**(cov + + k**nc);                      flag[0]  = 0;                   }                   if(*(data + j + k**nc)==1)                  {                      lower[1] = -*(theta+0)-*(theta+1)**(cov + j + k**nc);                      upper[1] = 0.0;                      flag[1]  = 1;                  }                  else                  {                      lower[1] = 0.0;                      upper[1] = -*(theta+0)-*(theta+1)**(cov + j + k**nc);                      flag[1]  = 0;                  }                   biv_pmnorm( &res2, &nu, lower, upper, flag, &corr ) ;                  res3+=log(res2);                  ite += 1;             }          }          res[k]=res3;          res3=0.0;      } }   //pairwise log-likelihood-->output: 1 value void bin_pairwise_llik_sum( double *res , double *data , double *cov, double *theta , int *n , int *nc  ) /* n = #righe ; nc = #colonne*/ {     register int k, i, j, ite=0;     int nu=0, flag[2];     double res2=0.0 , corr=theta[2], lower[2], upper[2];     *res=0.0;      for( k=0; k<*n; k++ )     {         for( i=0; i<(*nc-1); i++ )         {             for( j=(i+1); j<*nc; j++ )             {                  if(*(data + + k**nc)==1)                   {                      lower[0] = -*(theta+0)-*(theta+1)**(cov + + k**nc);                      upper[0] = 0.0;                      flag[0]  = 1;                  }                  else                  {                      lower[0] = 0.0;                      upper[0] = -*(theta+0)-*(theta+1)**(cov + + k**nc);                      flag[0]  = 0;                   }                   if(*(data + j + k**nc)==1)                  {                      lower[1] = -*(theta+0)-*(theta+1)**(cov + j + k**nc);                      upper[1] = 0.0;                      flag[1]  = 1;                  }                  else                  {                      lower[1] = 0.0;                      upper[1] = -*(theta+0)-*(theta+1)**(cov + j + k**nc);                      flag[1]  = 0;                  }                   biv_pmnorm( &res2, &nu, lower, upper, flag, &corr ) ;                  *res+=log(res2);                    ite += 1;             }          }      } }