Define MAXPATHLEN to be at least PATH_MAX, if that's defined. Python uses
MAXPATHLEN-sized buffers for various output-buffers (like to realpath()),
and that's correct on BSD platforms, but not Linux (which uses PATH_MAX, and
does not define MAXPATHLEN.) Cursory googling suggests Linux is following a
newer standard than BSD, but in cases like this, who knows. Using the
greater of PATH_MAX and 1024 as a fallback for MAXPATHLEN seems to be the
most portable solution.
diff --git a/Include/osdefs.h b/Include/osdefs.h
index 8190a75..6937659 100644
--- a/Include/osdefs.h
+++ b/Include/osdefs.h
@@ -37,8 +37,12 @@
/* Max pathname length */
#ifndef MAXPATHLEN
+#if defined(PATH_MAX) && PATH_MAX > 1024
+#define MAXPATHLEN PATH_MAX
+#else
#define MAXPATHLEN 1024
#endif
+#endif
/* Search path entry delimiter */
#ifndef DELIM
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index ac74a67..7f2356c 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -262,7 +262,11 @@
#endif /* OS2 */
#ifndef MAXPATHLEN
+#if defined(PATH_MAX) && PATH_MAX > 1024
+#define MAXPATHLEN PATH_MAX
+#else
#define MAXPATHLEN 1024
+#endif
#endif /* MAXPATHLEN */
#ifdef UNION_WAIT
diff --git a/Python/getcwd.c b/Python/getcwd.c
index 5c57291..967d484 100644
--- a/Python/getcwd.c
+++ b/Python/getcwd.c
@@ -14,8 +14,12 @@
#endif
#ifndef MAXPATHLEN
+#if defined(PATH_MAX) && PATH_MAX > 1024
+#define MAXPATHLEN PATH_MAX
+#else
#define MAXPATHLEN 1024
#endif
+#endif
extern char *getwd(char *);