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File _service:tar_scm:backport-Do-not-assume-PATH_MAX-is-defined.patch of Package less (Revision 4ec5a9c5f62e5a222b29e6128a50f2ab)

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From eea6fbc196872eeca6f02fcfba298f3e1bb62880 Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@hadrons.org>
Date: Thu, 11 Jan 2024 02:18:07 +0100
Subject: [PATCH] Do not assume PATH_MAX is defined

---
 filename.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/filename.c b/filename.c
index f910aa5..c6bc49e 100644
--- a/filename.c
+++ b/filename.c
@@ -812,9 +812,24 @@ public char * lrealpath(char *path)
 	if (!is_fake_pathname(path))
 	{
 #if HAVE_REALPATH
+		/*
+		 * Not all systems support the POSIX.1-2008 realpath() behavior
+		 * of allocating when passing a NULL argument. And PATH_MAX is
+		 * not required to be defined, or might contain an exceedingly
+		 * big value. We assume that if it is not defined (such as on
+		 * GNU/Hurd), then realpath() accepts NULL.
+		 */
+#ifndef PATH_MAX
+		char *rpath;
+
+		rpath = realpath(path, NULL);
+		if (rpath != NULL)
+			return (rpath);
+#else
 		char rpath[PATH_MAX];
 		if (realpath(path, rpath) != NULL)
 			return (save(rpath));
+#endif
 #endif
 	}
 	return (save(path));
-- 
2.27.0