diff -Nru libs3-2.0/debian/changelog libs3-2.0/debian/changelog
--- libs3-2.0/debian/changelog	2023-02-08 01:54:55.000000000 +0800
+++ libs3-2.0/debian/changelog	2023-05-30 14:58:36.000000000 +0800
@@ -1,3 +1,9 @@
+libs3 (2.0-4ubuntu1) mantic; urgency=medium
+
+  * Build with -O2 on ppc64el (LP: #2021564).
+
+ -- Shengjing Zhu <shengjing.zhu@canonical.com>  Tue, 30 May 2023 14:58:36 +0800
+
 libs3 (2.0-4) unstable; urgency=medium
 
   * Update debhelper level to 13 .
diff -Nru libs3-2.0/debian/rules libs3-2.0/debian/rules
--- libs3-2.0/debian/rules	2023-02-08 01:54:55.000000000 +0800
+++ libs3-2.0/debian/rules	2023-05-30 14:58:36.000000000 +0800
@@ -4,6 +4,10 @@
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
+ifneq (,$(filter $(DEB_HOST_ARCH), ppc64el))
+export DEB_CFLAGS_MAINT_APPEND := -O2
+endif
+
 DESTDIR = $(CURDIR)/debian/tmp/usr/
 
 override_dh_auto_build: