fix

Author: fchapoton

src/sage/libs/mpmath/ext_libmp.pyx

@@ -4,6 +4,9 @@ Faster versions of some key functions in mpmath.libmp
 
 from .ext_impl cimport *
 from sage.libs.gmp.all cimport *
+from sage.rings.integer cimport Integer
+
+from .ext_impl import exp_fixed, cos_sin_fixed, log_int_fixed
 
 # Note: not thread-safe
 cdef MPF tmp1