diff -up OpenBLAS-0.3.11/Makefile.power.override OpenBLAS-0.3.11/Makefile.power
--- OpenBLAS-0.3.11/Makefile.power.override	2020-10-17 22:14:12.000000000 +0200
+++ OpenBLAS-0.3.11/Makefile.power	2020-10-19 16:12:10.351740456 +0200
@@ -10,7 +10,7 @@ USE_OPENMP = 1
 endif
 
 ifeq ($(CORE), POWER10)
-COMMON_OPT += -Ofast -mcpu=power10 -mtune=power10 -mvsx  -fno-fast-math
+override COMMON_OPT += -Ofast -mcpu=power10 -mtune=power10 -mvsx  -fno-fast-math
 FCOMMON_OPT += -O2 -frecursive -mcpu=power10 -mtune=power10  -fno-fast-math
 endif