Index: usr.bin/xinstall/xinstall.c
===================================================================
--- usr.bin/xinstall/xinstall.c	(revision 196085)
+++ usr.bin/xinstall/xinstall.c	(working copy)
@@ -47,6 +47,8 @@
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
 #include <sys/mman.h>
 #include <sys/mount.h>
 #include <sys/stat.h>
@@ -83,6 +85,7 @@
 gid_t gid;
 uid_t uid;
 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
+int is_jailed;
 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
 const char *suffix = BACKUP_SUFFIX;
 
@@ -106,9 +109,11 @@
 	int ch, no_target;
 	u_int iflags;
 	char *flags;
+	size_t len = sizeof(int);
 	const char *group, *owner, *to_name;
 
 	iflags = 0;
+	is_jailed = 0;
 	group = owner = NULL;
 	while ((ch = getopt(argc, argv, "B:bCcdf:g:Mm:o:pSsv")) != -1)
 		switch((char)ch) {
@@ -242,6 +247,11 @@
 			errx(EX_USAGE, 
 			    "%s and %s are the same file", *argv, to_name);
 	}
+	if( sysctlbyname("security.jail.jailed", (void *)&is_jailed,
+				&len, NULL, 0) == -1 ) {
+		warn("Unable to get security.jail.jailed, assuming unjailed");
+		is_jailed = 0;
+	}
 	install(*argv, to_name, fset, iflags);
 	exit(EX_OK);
 	/* NOTREACHED */
@@ -506,6 +516,8 @@
 		if (flags & SETFLAGS) {
 			if (errno == EOPNOTSUPP)
 				warn("%s: chflags", to_name);
+			else if( errno == EPERM && is_jailed )
+				warn("%s: chflags", to_name);
 			else {
 				serrno = errno;
 				(void)unlink(to_name);