Issue #15835: Define PATH_MAX on HP-UX.

Include/osdefs.h

@@ -29,6 +29,14 @@ extern "C" {
 #endif
 
 /* Max pathname length */
+#ifdef __hpux
+#include <sys/param.h>
+#include <limits.h>
+#ifndef PATH_MAX
+#define PATH_MAX MAXPATHLEN
+#endif
+#endif
+
 #ifndef MAXPATHLEN
 #if defined(PATH_MAX) && PATH_MAX > 1024
 #define MAXPATHLEN PATH_MAX

Python/fileutils.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "osdefs.h"
 #ifdef MS_WINDOWS
 #  include <windows.h>
 #endif