diff --git a/fix-multiple-definition-error-with-gcc-10.patch b/fix-multiple-definition-error-with-gcc-10.patch
new file mode 100644
index 0000000..0a5952d
--- /dev/null
+++ b/fix-multiple-definition-error-with-gcc-10.patch
@@ -0,0 +1,52 @@
+From d40744a7c85af615d5a3bf3db382d35c50f1c508 Mon Sep 17 00:00:00 2001
+From: Wietse Venema <wietse@porcupine.org>
+Date: Sun, 26 Jan 2020 00:00:00 -0500
+Subject: [PATCH] postfix-3.5-20200126
+         Cleanup: missing 'extern' declarations in some header files.
+                  Eray Aslan. Files: postconf/postconf.h,smtpd/smtpd_expand.h, 
+                  trivial-rewrite/trivial-rewrite.h
+
+---
+ postfix/src/postconf/postconf.h               |  2 +-
+ postfix/src/smtpd/smtpd_expand.h              |  2 +-
+ postfix/src/trivial-rewrite/trivial-rewrite.h |  2 +-
+ 3 files changed, 6 insertions(+), 6 deletions(-)
+diff --git a/src/postconf/postconf.h b/src/postconf/postconf.h
+index 0f4764875..7b23380a5 100644
+--- a/src/postconf/postconf.h
++++ b/src/postconf/postconf.h
+@@ -152,7 +152,7 @@ typedef struct {
+   * Lookup table for master.cf entries. The table is terminated with an entry
+   * that has a null argv member.
+   */
+-PCF_MASTER_ENT *pcf_master_table;
++extern PCF_MASTER_ENT *pcf_master_table;
+ 
+  /*
+   * Line-wrapping support.
+diff --git a/src/smtpd/smtpd_expand.h b/src/smtpd/smtpd_expand.h
+index 71d705c01..3680036a0 100644
+--- a/src/smtpd/smtpd_expand.h
++++ b/src/smtpd/smtpd_expand.h
+@@ -18,7 +18,7 @@
+  /*
+   * External interface.
+   */
+-VSTRING *smtpd_expand_filter;
++extern VSTRING *smtpd_expand_filter;
+ void    smtpd_expand_init(void);
+ const char *smtpd_expand_lookup(const char *, int, void *);
+ int     smtpd_expand(SMTPD_STATE *, VSTRING *, const char *, int);
+diff --git a/src/trivial-rewrite/trivial-rewrite.h b/src/trivial-rewrite/trivial-rewrite.h
+index bf0dd4a08..42016efb0 100644
+--- a/src/trivial-rewrite/trivial-rewrite.h
++++ b/src/trivial-rewrite/trivial-rewrite.h
+@@ -23,7 +23,7 @@
+  /*
+   * Connection management.
+   */
+-int     server_flags;
++extern int server_flags;
+ 
+  /*
+   * rewrite.c
diff --git a/postfix.spec b/postfix.spec
index 08f6bc2..557cc36 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -23,7 +23,7 @@
 Name:           postfix
 Summary:        Postfix Mail Transport Agent
 Version:        3.3.1
-Release:        12
+Release:        13
 Epoch:          2
 URL:            http://www.postfix.org
 License:        (IPL-1.0 and GPLv2+) or (EPL-2.0 and GPLv2+)
@@ -44,6 +44,7 @@ Patch5:         pflogsumm-1.1.5-datecalc.patch
 Patch6:         pflogsumm-1.1.5-ipv6-warnings-fix.patch
 Patch7:         fix-postfix-build-failed.patch
 Patch8:         fix-build-error-with_glibc2.30-ftbfs.patch
+Patch9:         fix-multiple-definition-error-with-gcc-10.patch
 
 BuildRequires:  libdb-devel perl-generators pkgconfig zlib-devel systemd-units libicu-devel libnsl2-devel gcc m4 openldap-devel
 BuildRequires:  cyrus-sasl-devel pcre-devel mariadb-connector-c-devel postgresql-devel sqlite-devel openssl-devel procps-ng
@@ -105,6 +106,7 @@ PostgreSQL maps with Postfix, you need this.
 
 %patch7 -p1
 %patch8 -p1
+%patch9 -p1
 
 sed -i \
 's|^\(\s*#define\s\+DEF_SHLIB_DIR\s\+\)"/usr/lib/postfix"|\1"%{_libdir}/postfix"|' \
@@ -490,6 +492,12 @@ fi
 %{postfix_doc_dir}/README_FILES/*
 
 %changelog
+* Fri Jul 30 2021 gaihuiying <gaihuiying1@huawei.com> - 2:3.3.1-13
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:fix build error with gcc 10
+
 * Fri Feb 05 2021 caodongxia <caodongxia@huawei.com> - 2:3.3.1-12
 - Decouple the deprecated package tinycdb by removing subpackage postfix-cdb