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- that's right in C you need/should declare all variables at the beginning of the function

%module capa
%{

%}

%typemap(perl5,in) char** reterror (char* cvalue) {
  SV* tempsv;
  int len;
  if (!SvROK($source)) {
    croak("expected a reference\n");
  }
  tempsv = SvRV($source);
  if ((!SvPOK(tempsv))) {
    croak("expected a double reference\n");
  }
  cvalue = SvPV(tempsv,len);
  $target = &cvalue;
}

%typemap(perl5,argout) char ** reterror {
  SV *tempsv;
  tempsv = SvRV($arg);
  if (($source!=NULL) && (*$source!=NULL)) {
    sv_setpv(tempsv, *$source);
    free(*$source);
  }
}
extern int caparesponse_capa_check_answer(char *response,char *correct,
				   int type,int tol_type,double tolerance,
				   int sig_lbound,int sig_ubound, 
				   char *ans_fmt, char *unit_str,
				   int calc, char *id_list, char *pts_list,
				   char *rndseed, char** reterror);