diff --git a/0001-AVR-Fix-endianness-handling-in-AVR-MC.patch b/0001-AVR-Fix-endianness-handling-in-AVR-MC.patch
new file mode 100644
index 0000000..aba1d2a
--- /dev/null
+++ b/0001-AVR-Fix-endianness-handling-in-AVR-MC.patch
@@ -0,0 +1,42 @@
+From 29b4d8f19e30910c099c5453da258843d6b7869a Mon Sep 17 00:00:00 2001
+From: serge_sans_paille <sguelton@redhat.com>
+Date: Tue, 24 Sep 2019 10:20:08 +0200
+Subject: [PATCH] [AVR] Fix endianness handling in AVR MC
+
+Differential Revision: https://reviews.llvm.org/D67926
+---
+ llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp | 8 +++-----
+ 1 file changed, 3 insertions(+), 5 deletions(-)
+
+diff --git a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
+index bc048877868..db995e24756 100644
+--- a/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
++++ b/llvm/lib/Target/AVR/MCTargetDesc/AVRMCCodeEmitter.cpp
+@@ -25,6 +25,7 @@
+ #include "llvm/MC/MCRegisterInfo.h"
+ #include "llvm/MC/MCSubtargetInfo.h"
+ #include "llvm/Support/Casting.h"
++#include "llvm/Support/EndianStream.h"
+ #include "llvm/Support/raw_ostream.h"
+ 
+ #define DEBUG_TYPE "mccodeemitter"
+@@ -268,14 +269,11 @@ unsigned AVRMCCodeEmitter::getMachineOpValue(const MCInst &MI,
+ void AVRMCCodeEmitter::emitInstruction(uint64_t Val, unsigned Size,
+                                        const MCSubtargetInfo &STI,
+                                        raw_ostream &OS) const {
+-  const uint16_t *Words = reinterpret_cast<uint16_t const *>(&Val);
+   size_t WordCount = Size / 2;
+ 
+   for (int64_t i = WordCount - 1; i >= 0; --i) {
+-    uint16_t Word = Words[i];
+-
+-    OS << (uint8_t) ((Word & 0x00ff) >> 0);
+-    OS << (uint8_t) ((Word & 0xff00) >> 8);
++    uint16_t Word = (Val >> (i * 16)) & 0xFFFF;
++    support::endian::write(OS, Word, support::endianness::little);
+   }
+ }
+ 
+-- 
+2.20.1
+
diff --git a/llvm.spec b/llvm.spec
index 1f544f4..39c876c 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -14,7 +14,7 @@
 %global min_ver 0
 %global patch_ver 0
 #%%global rc_ver 3
-%global baserelease 3
+%global baserelease 4
 
 
 %if %{with compat_build}
@@ -56,6 +56,7 @@ Patch0:		0001-Filter-out-cxxflags-not-supported-by-clang.patch
 Patch1:		0001-Pass-target-to-gold-linker-to-avoid-faliures-on-i686.patch
 Patch2:		0001-CMake-Split-static-library-exports-into-their-own-ex.patch
 Patch3:		0001-CMake-Split-test-binary-exports-into-their-own-expor.patch
+Patch4:		0001-AVR-Fix-endianness-handling-in-AVR-MC.patch
 
 BuildRequires:	gcc
 BuildRequires:	gcc-c++
@@ -200,9 +201,7 @@ cd _build
 %if %{with gold}
 	-DLLVM_BINUTILS_INCDIR=%{_includedir} \
 %endif
-%ifnarch s390 s390x
 	-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR \
-%endif
 	\
 	-DLLVM_BUILD_RUNTIME:BOOL=ON \
 	\
@@ -480,6 +479,9 @@ fi
 %endif
 
 %changelog
+* Mon Nov 25 2019 sguelton@redhat.com - 9.0.0-4
+- Activate AVR on all architectures
+
 * Mon Sep 30 2019 Tom Stellard <tstellar@redhat.com> - 9.0.0-3
 - Build libLLVM.so first to avoid OOM errors