diff --git a/bind-9.16-isc-constructor.h b/bind-9.16-isc-constructor.h
new file mode 100644
index 0000000..71a08b3
--- /dev/null
+++ b/bind-9.16-isc-constructor.h
@@ -0,0 +1,53 @@
+From 48df32cadb5071f5b186b00da3f4406a13320b44 Mon Sep 17 00:00:00 2001
+From: Petr Mensik <pemensik@redhat.com>
+Date: Fri, 26 Mar 2021 11:01:59 +0100
+Subject: [PATCH] Do not require config.h to use isc/util.h
+
+util.h requires ISC_CONSTRUCTOR definition, which depends on config.h
+inclusion. It does not include it from isc/util.h (or any other header).
+Using isc/util.h fails hard when isc/util.h is used without including
+bind's config.h.
+
+Move the check to c file, where ISC_CONSTRUCTOR is used. Ensure config.h
+is included there.
+---
+ lib/isc/include/isc/util.h | 2 --
+ lib/isc/lib.c              | 5 +++++
+ 2 files changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/lib/isc/include/isc/util.h b/lib/isc/include/isc/util.h
+index 3c8c40b..3144557 100644
+--- a/lib/isc/include/isc/util.h
++++ b/lib/isc/include/isc/util.h
+@@ -54,8 +54,6 @@
+ #elif WIN32
+ #define ISC_CONSTRUCTOR(priority)
+ #define ISC_DESTRUCTOR(priority)
+-#else
+-#error Either __attribute__((constructor|destructor))__ or DllMain support needed to compile BIND 9.
+ #endif
+ 
+ /*%
+diff --git a/lib/isc/lib.c b/lib/isc/lib.c
+index 27d7be1..08a1b91 100644
+--- a/lib/isc/lib.c
++++ b/lib/isc/lib.c
+@@ -17,10 +17,15 @@
+ #include <isc/tls.h>
+ #include <isc/util.h>
+ 
++#include "config.h"
+ #include "mem_p.h"
+ #include "tls_p.h"
+ #include "trampoline_p.h"
+ 
++#ifndef ISC_CONSTRUCTOR
++#error Either __attribute__((constructor|destructor))__ or DllMain support needed to compile BIND 9.
++#endif
++
+ /***
+  *** Functions
+  ***/
+-- 
+2.26.2
+
diff --git a/bind.spec b/bind.spec
index b17e8dc..c8d95c0 100644
--- a/bind.spec
+++ b/bind.spec
@@ -114,6 +114,8 @@ Patch157:bind-9.11-fips-tests.patch
 Patch164:bind-9.11-rh1666814.patch
 Patch170:bind-9.11-feature-test-named.patch
 Patch171:bind-9.11-tests-variants.patch
+# https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/4840
+Patch172:bind-9.16-isc-constructor.h
 
 Requires(post):   systemd
 Requires(preun):  systemd
@@ -418,6 +420,7 @@ in HTML and PDF format.
 %patch164 -p1 -b .rh1666814
 %patch170 -p1 -b .featuretest-named
 %patch171 -p1 -b .test-variant
+%patch172 -p1 -b .isc-constructor
 
 %if %{with PKCS11}
 %patch135 -p1 -b .config-pkcs11
@@ -708,11 +711,6 @@ install -m 644 %{SOURCE49} ${RPM_BUILD_ROOT}%{_sysconfdir}/named-chroot.files
 # Install isc/errno2result.h header
 install -m 644 lib/isc/unix/errno2result.h ${RPM_BUILD_ROOT}%{_includedir}/bind9/isc
 
-pushd build
-# Files required to run test-suite outside of build tree:
-cp -fp config.h ${RPM_BUILD_ROOT}/%{_includedir}/bind9
-popd
-
 # Remove libtool .la files:
 find ${RPM_BUILD_ROOT}/%{_libdir} -name '*.la' -exec '/bin/rm' '-f' '{}' ';';
 
@@ -1035,7 +1033,6 @@ fi;
 %{_libdir}/libisc.so
 %{_libdir}/libisccfg.so
 %dir %{_includedir}/bind9
-%{_includedir}/bind9/config.h
 %{_includedir}/bind9/bind9
 %{_includedir}/bind9/isccc
 %{_includedir}/bind9/ns