--- src/Makevars.in.orig	2023-05-13 20:29:12 UTC
+++ src/Makevars.in
@@ -1,6 +1,6 @@
 PKG_CPPFLAGS = -I../src -DSTRICT_R_HEADERS
 PKG_LIBS = @libs@
-PKG_CXXFLAGS = @cflags@ -pthread
+PKG_CXXFLAGS = @cflags@ -pthread -mcpu=power7
 
 CXX_STD = CXX11
 
