diff -up src/sage/libs/singular/singular.pyx.orig src/sage/libs/singular/singular.pyx
--- src/sage/libs/singular/singular.pyx.orig	2017-03-04 13:34:53.241494624 -0500
+++ src/sage/libs/singular/singular.pyx	2017-03-04 13:35:03.289495008 -0500
@@ -23,6 +23,8 @@ cdef extern from "limits.h":
     long INT_MAX
     long INT_MIN
 
+from libc.stdint cimport int64_t
+
 import os
 
 from libc.stdint cimport int64_t