--- a/TSRM/tsrm_config_common.h
+++ b/TSRM/tsrm_config_common.h
@@ -1,6 +1,10 @@
 #ifndef TSRM_CONFIG_COMMON_H
 #define TSRM_CONFIG_COMMON_H
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 #ifndef __CYGWIN__
 # if WINNT|WIN32
 #  define TSRM_WIN32
--- a/ext/date/lib/parse_tz.c
+++ b/ext/date/lib/parse_tz.c
@@ -18,6 +18,10 @@
 
 /* $Id: parse_tz.c 293036 2010-01-03 09:23:27Z sebastian $ */
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 #include "timelib.h"
 
 #include <stdio.h>
--- a/ext/standard/proc_open.c
+++ b/ext/standard/proc_open.c
@@ -24,6 +24,10 @@
 # define __EXTENSIONS__	1	/* Solaris: uint */
 #endif
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 #include "php.h"
 #include <stdio.h>
 #include <ctype.h>
--- a/main/php.h
+++ b/main/php.h
@@ -248,6 +248,10 @@ END_EXTERN_C()
 /* macros */
 #define STR_PRINT(str)	((str)?(str):"")
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 #ifndef MAXPATHLEN
 # ifdef PATH_MAX
 #  define MAXPATHLEN PATH_MAX