text: #ifndef __READ_XLS_CRAN_H
  #define __READ_XLS_CRAN_H
  
  /* Mask printf for CMD check */
  #include <Rinternals.h>
  #define printf Rprintf
  #define fprintf(err, ...) Rprintf(__VA_ARGS__)
  #define exit assert
  #undef assert
  #define assert(X) if (X) {}
  
  #endif
  