diff --git a/0006-asmcomp-dune-fix-build-on-RISC-V.patch b/0006-asmcomp-dune-fix-build-on-RISC-V.patch
new file mode 100644
index 0000000000000000000000000000000000000000..d0e8e0442fbf28acc22c0f8d00c6813d0765902b
--- /dev/null
+++ b/0006-asmcomp-dune-fix-build-on-RISC-V.patch
@@ -0,0 +1,48 @@
+From 063cd86c18b9815a76549c4ad5e82103898ade23 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Edwin=20T=C3=B6r=C3=B6k?= <edwin@etorok.net>
+Date: Tue, 8 Jun 2021 20:32:23 +0000
+Subject: [PATCH] asmcomp/dune: fix build on RISC-V
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+dune build @libs was failing with
+```
+        bash asmcomp/CSE.ml,asmcomp/arch.ml,asmcomp/proc.ml,asmcomp/reload.ml,asmcomp/scheduling.ml,asmcomp/selection.ml (exit 1)
+(cd _build/default/asmcomp && /bin/bash -e -u -o pipefail -c 'cp `grep '\''^ARCH='\'' ../Makefile.config | cut -d'\''='\'' -f2`/*.ml .')
+cp: cannot stat 'riscv/*.ml': No such file or directory
+        bash asmcomp/contains-input-name,asmcomp/emit.ml (exit 1)
+(cd _build/default/asmcomp && /bin/bash -e -u -o pipefail -c '../tools/cvt_emit.exe < `cat contains-input-name`') > _build/default/asmcomp/emit.ml
+/bin/bash: line 1: riscv/emit.mlp: No such file or directory
+```
+
+No change entry needed
+
+Signed-off-by: Edwin Török <edwin@etorok.net>
+---
+ asmcomp/dune | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/asmcomp/dune b/asmcomp/dune
+index a208b56e5..1a4d561d6 100644
+--- a/asmcomp/dune
++++ b/asmcomp/dune
+@@ -21,6 +21,7 @@
+           (glob_files arm64/*.ml)
+           (glob_files i386/*.ml)
+           (glob_files power/*.ml)
++          (glob_files riscv/*.ml)
+           (glob_files s390x/*.ml))
+  (action  (bash "cp `grep '^ARCH=' %{conf} | cut -d'=' -f2`/*.ml .")))
+ 
+@@ -33,6 +34,7 @@
+           arm64/emit.mlp
+           i386/emit.mlp
+           power/emit.mlp
++          riscv/emit.mlp
+           s390x/emit.mlp)
+  (action
+    (progn
+-- 
+2.39.0.windows.2
+
diff --git a/ocaml.spec b/ocaml.spec
index acbb2e0714ad11629f87e5d8ff4079f87b2fd458..63926df2fd70ce7c427af489a512cc6cd4d2405e 100644
--- a/ocaml.spec
+++ b/ocaml.spec
@@ -1,6 +1,6 @@
 Name:           ocaml
 Version:        4.13.1
-Release:        5
+Release:        6
 Summary:        OCaml compiler and programming environment
 License:        LGPL-2.1-only
 URL:            http://www.ocaml.org
@@ -11,6 +11,7 @@ Patch0002:      0002-configure-Allow-user-defined-C-compiler-flags.patch
 Patch0003:      0003-configure-Remove-incorrect-assumption-about-cross-co.patch
 Patch0004:      0004-Update-dependencies.patch
 Patch0005:      0005-Bug-fix-equal_private-was-being-used-in-too-many-pla.patch
+Patch0006:      0006-asmcomp-dune-fix-build-on-RISC-V.patch
 
 BuildRequires:  gcc binutils-devel ncurses-devel gdbm-devel  gawk perl-interpreter 
 BuildRequires:  util-linux chrpath autoconf annobin make
@@ -201,6 +202,9 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/ocaml/eventlog_metadata
 %{_mandir}/man3/*
 
 %changelog
+* Thu Jan 18 2023 xingxing <xingxing@xfusion.com> - 4.13.1-6
+- fix build on RISC-V 
+
 * Tue Jan 18 2023 xingxing<xingxing@xfusion.com> - 4.13.1-5
 - Bug fix equal private was being used in too many pla