diff --git a/mercurial/cext/osutil.c b/mercurial/cext/osutil.c
--- a/mercurial/cext/osutil.c
+++ b/mercurial/cext/osutil.c
@@ -1217,7 +1217,9 @@ static PyObject *posixfile(PyObject *sel
 	char fpmode[4];
 	int fppos = 0;
 	int plus;
+#ifndef IS_PY3K
 	FILE *fp;
+#endif
 
 	if (!PyArg_ParseTupleAndKeywords(args, kwds, PY23("et|si:posixfile",
 							  "et|yi:posixfile"),
diff --git a/mercurial/compat.h b/mercurial/compat.h
--- a/mercurial/compat.h
+++ b/mercurial/compat.h
@@ -3,6 +3,7 @@
 
 #ifdef _WIN32
 #ifdef _MSC_VER
+#if _MSC_VER < 1900
 /* msvc 6.0 has problems */
 #define inline __inline
 #if defined(_WIN64)
@@ -21,6 +22,18 @@ typedef unsigned short uint16_t;
 typedef unsigned long uint32_t;
 typedef unsigned __int64 uint64_t;
 #else
+/* VC++ 14 */
+#include <stdint.h>
+
+#if defined(_WIN64)
+typedef __int64 ssize_t;
+#else
+typedef int ssize_t;
+#endif
+#endif /* _MSC_VER < 1900 */
+
+#else
+/* not msvc */
 #include <stdint.h>
 #endif
 #else