- Only define mpi_read_file and mpi_write_file if POLARSSL_FS_IO is present
diff --git a/include/polarssl/bignum.h b/include/polarssl/bignum.h
index b4a6c06..e2d9347 100644
--- a/include/polarssl/bignum.h
+++ b/include/polarssl/bignum.h
@@ -299,6 +299,7 @@
*/
int mpi_write_string( const mpi *X, int radix, char *s, size_t *slen );
+#if defined(POLARSSL_FS_IO)
/**
* \brief Read X from an opened file
*
@@ -325,6 +326,7 @@
* \note Set fout == NULL to print X on the console.
*/
int mpi_write_file( const char *p, const mpi *X, int radix, FILE *fout );
+#endif /* POLARSSL_FS_IO */
/**
* \brief Import X from unsigned binary data, big endian