diff --git a/mercurial/bdiff.c b/mercurial/bdiff.c
--- a/mercurial/bdiff.c
+++ b/mercurial/bdiff.c
@@ -12,8 +12,22 @@
 #include <Python.h>
 #include <stdlib.h>
 #include <string.h>
-#include <netinet/in.h>
-#include <sys/types.h>
+#ifdef _WIN32
+
+typedef unsigned long uint32_t;
+
+static uint32_t htonl(uint32_t x)
+{
+	return ((x & 0x000000ffUL) << 24) |
+		((x & 0x0000ff00UL) <<  8) |
+		((x & 0x00ff0000UL) >>  8) |
+		((x & 0xff000000UL) >> 24);
+}
+
+#else
+  #include <netinet/in.h>
+  #include <sys/types.h>
+#endif
 
 struct line {
 	int h, len, n;
diff --git a/mercurial/mpatch.c b/mercurial/mpatch.c
--- a/mercurial/mpatch.c
+++ b/mercurial/mpatch.c
@@ -27,11 +27,12 @@
 
 typedef unsigned long uint32_t;
 
-uint32_t ntohl(uint32_t x) {
-  return ((x & 0x000000ffUL) << 24) |
-         ((x & 0x0000ff00UL) <<  8) |
-         ((x & 0x00ff0000UL) >>  8) |
-         ((x & 0xff000000UL) >> 24);
+static uint32_t ntohl(uint32_t x)
+{
+	return ((x & 0x000000ffUL) << 24) |
+		((x & 0x0000ff00UL) <<  8) |
+		((x & 0x00ff0000UL) >>  8) |
+		((x & 0xff000000UL) >> 24);
 }
 
 #else