diff -urP ../bash-5.0.orig/config.h.in config.h.in
--- ../bash-5.0.orig/config.h.in	2018-12-04 09:54:17.000000000 -0700
+++ config.h.in	2019-12-10 11:34:42.157926317 -0700
@@ -1,6 +1,6 @@
 /* config.h -- Configuration file for bash. */
 
-/* Copyright (C) 1987-2009,2011-2012 Free Software Foundation, Inc.
+/* Copyright (C) 1987-2009,2011-2012,2013-2019 Free Software Foundation, Inc.
 
    This file is part of GNU Bash, the Bourne Again SHell.
 
@@ -807,6 +807,14 @@
 #undef HAVE_SETREGID
 #undef HAVE_DECL_SETREGID
 
+/* Define if you have the setregid function.  */
+#undef HAVE_SETRESGID
+#undef HAVE_DECL_SETRESGID
+
+/* Define if you have the setresuid function.  */
+#undef HAVE_SETRESUID
+#undef HAVE_DECL_SETRESUID
+
 /* Define if you have the setvbuf function.  */
 #undef HAVE_SETVBUF
 
diff -urP ../bash-5.0.orig/configure configure
--- ../bash-5.0.orig/configure	2019-01-02 07:43:31.000000000 -0700
+++ configure	2019-12-10 11:34:42.166926317 -0700
@@ -10281,6 +10281,17 @@
 #define HAVE_DECL_SETREGID $ac_have_decl
 _ACEOF
 
+ac_fn_c_check_decl "$LINENO" "" "ac_cv_have_decl_" "$ac_includes_default"
+if test "x$ac_cv_have_decl_" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_ $ac_have_decl
+_ACEOF
+(setresuid, setresgid)
 ac_fn_c_check_decl "$LINENO" "strcpy" "ac_cv_have_decl_strcpy" "$ac_includes_default"
 if test "x$ac_cv_have_decl_strcpy" = xyes; then :
   ac_have_decl=1
diff -urP ../bash-5.0.orig/configure.ac configure.ac
--- ../bash-5.0.orig/configure.ac	2019-01-02 07:39:11.000000000 -0700
+++ configure.ac	2019-12-10 11:34:42.168926317 -0700
@@ -810,6 +810,7 @@
 AC_CHECK_DECLS([printf])
 AC_CHECK_DECLS([sbrk])
 AC_CHECK_DECLS([setregid])
+AC_CHECK_DECLS[(setresuid, setresgid])
 AC_CHECK_DECLS([strcpy])
 AC_CHECK_DECLS([strsignal])
 
diff -urP ../bash-5.0.orig/shell.c shell.c
--- ../bash-5.0.orig/shell.c	2018-12-06 09:28:21.000000000 -0700
+++ shell.c	2019-12-10 11:34:42.170926317 -0700
@@ -1293,7 +1293,11 @@
 {
   int e;
 
+#if HAVE_DECL_SETRESUID
+  if (setresuid (current_user.uid, current_user.uid, current_user.uid) < 0)
+#else
   if (setuid (current_user.uid) < 0)
+#endif
     {
       e = errno;
       sys_error (_("cannot set uid to %d: effective uid %d"), current_user.uid, current_user.euid);
@@ -1302,7 +1306,11 @@
 	exit (e);
 #endif
     }
+#if HAVE_DECL_SETRESGID
+  if (setresgid (current_user.gid, current_user.gid, current_user.gid) < 0)
+#else
   if (setgid (current_user.gid) < 0)
+#endif
     sys_error (_("cannot set gid to %d: effective gid %d"), current_user.gid, current_user.egid);
 
   current_user.euid = current_user.uid;