diff --git a/0008-backport-C-Fix-compiler-error-from-deleted-assignment-operato.patch b/0008-backport-C-Fix-compiler-error-from-deleted-assignment-operato.patch
new file mode 100644
index 0000000000000000000000000000000000000000..3d89bb75fac80f1c27dd01ac93ea3f0b6ad79ae6
--- /dev/null
+++ b/0008-backport-C-Fix-compiler-error-from-deleted-assignment-operato.patch
@@ -0,0 +1,32 @@
+From 7987ba574b478fa86449467f5b83ca9adcbe53c8 Mon Sep 17 00:00:00 2001
+From: jdess <4703565+jdess@users.noreply.github.com>
+Date: Fri, 24 Jul 2020 10:17:06 +0200
+Subject: [PATCH] [C++] Fix compiler error from deleted assignment operator
+ (#6036)
+
+The assignment operator of the `buf_` member is deleted, we cannot call it from the assignment operator of the `TableKeyComparator` struct.
+
+=> Also delete the assignment operator of the `TableKeyComparator` struct (already private anyhow).
+---
+ .../thirdparty/flatbuffers/include/flatbuffers/flatbuffers.h | 5 +----
+ 1 file changed, 1 insertion(+), 4 deletions(-)
+
+diff --git a/src/arrow/cpp/thirdparty/flatbuffers/include/flatbuffers/flatbuffers.h b/src/arrow/cpp/thirdparty/flatbuffers/include/flatbuffers/flatbuffers.h
+index c4dc5bcd0..0f3a7dfd9 100644
+--- a/src/arrow/cpp/thirdparty/flatbuffers/include/flatbuffers/flatbuffers.h
++++ b/src/arrow/cpp/thirdparty/flatbuffers/include/flatbuffers/flatbuffers.h
+@@ -1871,10 +1871,7 @@ class FlatBufferBuilder {
+     vector_downward &buf_;
+ 
+    private:
+-    TableKeyComparator &operator=(const TableKeyComparator &other) {
+-      buf_ = other.buf_;
+-      return *this;
+-    }
++    FLATBUFFERS_DELETE_FUNC(TableKeyComparator &operator=(const TableKeyComparator &other))
+   };
+   /// @endcond
+ 
+-- 
+2.51.0
+
diff --git a/ceph.spec b/ceph.spec
index 091034a1b95c58e5ccb5c9020dce07d3d8b86b02..2e865f815d32e57e0567b55a8dd7b6e996e8e687 100644
--- a/ceph.spec
+++ b/ceph.spec
@@ -174,7 +174,7 @@
 #################################################################################
 Name:		ceph
 Version:	18.2.2
-Release:	8
+Release:	9
 %if 0%{?fedora} || 0%{?rhel} || 0%{?openEuler}
 Epoch:		2
 %endif
@@ -199,6 +199,8 @@ Patch4: 0004-fix-mds-metadata-lost-in-one-case.patch
 Patch5: 0005-fix-CVE-2024-48916.patch
 Patch6: 0006-client-set-LIBMOUNT_FORCE_MOUNT2-always.patch
 Patch7: 0007-client-disallow-unprivileged-users-to-escalate-root.patch
+# https://github.com/google/flatbuffers/pull/6047
+Patch8: 0008-backport-C-Fix-compiler-error-from-deleted-assignment-operato.patch
 
 %ifarch riscv64
 Patch9002: 9002-fix-riscv64-build.patch
@@ -1336,8 +1338,8 @@ done
 %endif
 
 export CPPFLAGS="$java_inc"
-export CFLAGS="$RPM_OPT_FLAGS"
-export CXXFLAGS="$RPM_OPT_FLAGS"
+export CFLAGS="$RPM_OPT_FLAGS -Wno-error=int-conversion"
+export CXXFLAGS="$RPM_OPT_FLAGS -Wno-error=int-conversion"
 export LDFLAGS="$RPM_LD_FLAGS"
 
 %if 0%{with seastar}
@@ -2645,6 +2647,9 @@ exit 0
 %{_datadir}/snmp/mibs
 
 %changelog
+* Thu Sep 04 2025 jchzhou <zhoujiacheng@iscas.ac.cn> - 2:18.2.2-9
+- backport a patch for fixing building issues
+
 * Mon Jul 7 2025 lizhipeng <lizhipeng@kylinos.com> - 2:18.2.2-8
 - fix CVE-2025-52555