diff -ru -x Makefile -x autom4te.cache -x config.h -x config.h.in -x 'config.h.in~' -x config.log -x config.status -x configure priv-1.0-beta2.orig/configure.in priv-1.0-beta2/configure.in
--- priv-1.0-beta2.orig/configure.in	1997-07-08 09:19:05.000000000 +0300
+++ priv-1.0-beta2/configure.in	2020-10-22 00:26:22.154975620 +0300
@@ -40,13 +40,14 @@
 
 dnl Checks for libraries
 dnl ====================
+AC_SEARCH_LIBS(setusercontext, util)
 
 dnl Checks for header files
 dnl =======================
 AC_HEADER_STDC
 AC_HEADER_TIME
-AC_CHECK_HEADERS(limits.h stdarg.h stdlib.h string.h stringlist.h syslog.h \
-	unistd.h sys/syslog.h)
+AC_CHECK_HEADERS(err.h limits.h login_cap.h stdarg.h stdlib.h string.h \
+	stringlist.h syslog.h unistd.h sys/syslog.h)
 
 dnl Checks for typedefs, structures, and compiler characteristics
 dnl =============================================================
diff -ru -x Makefile -x autom4te.cache -x config.h -x config.h.in -x 'config.h.in~' -x config.log -x config.status -x configure priv-1.0-beta2.orig/priv.c priv-1.0-beta2/priv.c
--- priv-1.0-beta2.orig/priv.c	2004-02-09 06:37:07.000000000 +0200
+++ priv-1.0-beta2/priv.c	2020-10-22 00:45:12.008980777 +0300
@@ -318,6 +318,17 @@
 	}
 
 	/* Set up the permissions */
+#ifdef HAVE_LOGIN_CAP_H
+	if (setusercontext(NULL, pw, pw->pw_uid, LOGIN_SETGROUP |
+	    LOGIN_SETPRIORITY | LOGIN_SETRESOURCES | LOGIN_SETUMASK |
+	    LOGIN_SETUSER) != 0) {
+		sverr = errno;
+		syslog(LOG_NOTICE, "%s: not ok: setusercontext failed: %m",
+		    myfullname);
+		errno = sverr;
+		err(EXIT_VAL, "setusercontext failed");
+	}
+#else
 	if (setgid(pw->pw_gid) < 0) {
 		sverr = errno;
 		syslog(LOG_NOTICE, "%s: not ok: setgid failed: %m", myfullname);
@@ -337,6 +348,7 @@
 		errno = sverr;
 		err(EXIT_VAL, "setuid failed");
 	}
+#endif
 
 	/* Check for sym-link */
 	if (!(nflags & F_SYMLINK)) {
diff -ru -x Makefile -x autom4te.cache -x config.h -x config.h.in -x 'config.h.in~' -x config.log -x config.status -x configure priv-1.0-beta2.orig/priv.h priv-1.0-beta2/priv.h
--- priv-1.0-beta2.orig/priv.h	1997-07-08 09:19:07.000000000 +0300
+++ priv-1.0-beta2/priv.h	2020-10-22 00:26:45.589106034 +0300
@@ -89,6 +89,14 @@
 # endif
 #endif
 
+#ifdef HAVE_LOGIN_CAP_H
+# include <login_cap.h>
+#endif
+
+#ifdef HAVE_ERR_H
+# include <err.h>
+#endif
+
 #define DEFPATH		"/bin:/usr/bin"
 #define SYSLOGNAME	"priv"			/* name used with syslog */
 #define LOGBUFSIZ	2048 + 256		/* number of chars to log */
@@ -140,10 +148,10 @@
 #ifndef HAVE_STRERROR
 char   *strerror(int errnum);
 #endif
-#ifdef HAVE_STRSPN
+#ifndef HAVE_STRSPN
 size_t  strspn(const char *s, const char *charset);
 #endif
-#ifdef HAVE_STRTOUL
+#ifndef HAVE_STRTOUL
 unsigned long strtoul(const char *nptr, char **endptr, int base);
 #endif