--- src/Makevars.in.orig	2021-07-06 12:09:16 UTC
+++ src/Makevars.in
@@ -1,6 +1,6 @@
 PKG_CPPFLAGS = -I../inst/include -DSTRICT_R_HEADERS
 PKG_LIBS = @libs@
-PKG_CXXFLAGS = @cflags@ -pthread
+PKG_CXXFLAGS = @cflags@ -pthread -mcpu=power7
 CXX_STD = CXX11
 
 OBJECTS = cpp-compat.o \